CN106133588B

CN106133588B - Anisotropic optical film

Info

Publication number: CN106133588B
Application number: CN201580015752.8A
Authority: CN
Inventors: 坂野翼; 杉山仁英
Original assignee: Tomoegawa Paper Co Ltd
Current assignee: Tomoegawa Co Ltd
Priority date: 2014-03-28
Filing date: 2015-03-17
Publication date: 2019-08-23
Anticipated expiration: 2035-03-17
Also published as: WO2015146708A1; KR102316118B1; US9989678B2; US20170192137A1; TW201545885A; JP2015191178A; CN106133588A; JP6288672B2; TWI654087B; KR20160137964A

Abstract

A kind of anisotropic optical film is provided, by obtaining straight line transmittance with high in non-diffusing regions, and with the wide diffusion zone on the direction MD and the direction TD, so as to eliminate the change dramatically of brightness, generation such problems of dazzle.In being laminated with anisotropic optical film of two layers or more the straight line transmittance according to the changed anisotropy light diffusion layer of incident light angle, multiple cylindrical regions that aforementioned anisotropy light diffusion layer respectively has matrix region and refractive index different from the matrix region, as aforementioned anisotropy light diffusion layer, at least use the two kind anisotropy light diffusion layers (a) and anisotropy light diffusion layer (b) different with the aspect ratio of major diameter from the minor axis in the vertical section of the differently- oriented directivity of aforementioned cylindrical region, the minor axis of aforementioned cylindrical region of aforementioned anisotropy light diffusion layer (a) and the aspect ratio of major diameter are set as less than 2, the minor axis of aforementioned cylindrical region of aforementioned anisotropy light diffusion layer (b) and the aspect ratio of major diameter are set as in 2 or more and 20 or less range.

Description

Anisotropic optical film

Technical field

The present invention relates to the changed anisotropic optical films of diffusivity that light is penetrated according to incident light angle.

Background technique

Component (light pervasion component) with light diffusing is also made in a display device other than lighting apparatus, building materials With.As the display device, for example, having liquid crystal display device (LCD), organic electroluminescent device (organic EL) etc..As light The light of pervasion component spreads outgoing mechanism, can enumerate the scattering (surface scattering) using the bumps for being formed in surface, utilize matrix The scattering (scattering-in) and utilization surface scattering of refringence between resin and the particulate being dispersed therein and inside dissipate Penetrate the scattering of the two.But in general its diffusion is isotropic to these light pervasion components, even if making angle of incident light Slight variations occur for degree, through the diffusion property also not big difference of light.

On the other hand, it is known that the incident light of certain angular regions spread by force, the incident light of angle other than it into It is that row penetrates, can be made straight line through the changed anisotropic optical film of light quantity according to incident light angle.As in this way Anisotropic optical film, disclose in the resin layer that the solidfied material by the composition comprising photopolymerizable compound is formed Portion is formed with the anisotropy of the aggregate relative to the defined direction P multiple rodlike consolidation zones all extended parallel to Dispersive medium (for example, referring to patent document 1).It is explained, hereinafter, in the present specification, will be recorded in patent document 1 As, be formed with aggregate relative to the defined direction P multiple rodlike consolidation zones extended parallel to it is each to different Property optical film structure be known as " rod structure ".

In the anisotropic optical film of such rod structure, when to the film incident light downwards from the upper side, in film Flow direction (hereinafter referred to as " direction MD " in manufacturing process.) and the film vertical with the direction MD width direction (hereinafter, claim For " direction TD ".) on, show identical diffusion.That is, the diffusion in the anisotropic optical film of rod structure shows isotropism. Therefore, in the anisotropic optical film of rod structure, change dramatically, the dazzle of brightness are not susceptible to.

But there are the following problems for the anisotropic optical film of rod structure: the high incident light angle range of straight line transmittance Straight line transmittance i.e. in non-diffusing regions is low, and low (that is, diffusion strength is high) the incident light angle range of straight line transmittance is The width (diffusion breadth) of diffusion zone is narrow.

On the other hand, as anisotropic optical film, by using not above-mentioned rod structure, by gathering comprising light The inside for the resin layer that the solidfied material of the composition of conjunction property compound is formed, is formed with the collection of one or more plate consolidation zones Fit anisotropic optical film (for example, referring to patent document 2), so as to propose the straight line transmittance in non-diffusing regions Height makes diffusion breadth broaden.It is explained, hereinafter, in the present specification, as being recorded in patent document 2, shape Structure at the anisotropic optical film for the aggregate for having one or more plate consolidation zones becomes " shutter ".At this In the anisotropic optical film of the shutter of sample, when to the film incident light downwards from the upper side, in the direction MD and TD Direction shows different diffusions.That is, the diffusion in the anisotropic optical film of shutter shows anisotropy.It is specific and Speech, for example, diffusion breadth compares column in the direction TD if the width (diffusion breadth) in the direction MD diffusion zone is wider than rod structure Structure is narrow.Therefore, there are the following problems in the anisotropic optical film of shutter: for example, when in the direction TD diffusion breadth When narrow, the change dramatically of brightness occurs in the direction TD, as a result easily causes the interference of light and is easy to happen dazzle.

In this regard, in order to solve asking for the anisotropic optical film of the anisotropic optical film of rod structure and shutter It inscribes, there is good incident light angle interdependence, while the width of diffusion zone being made to broaden in the transmission and diffusion of light, for example, Patent document 3 discloses the anisotropy light diffusion layer and blinds for making rod structure (being equivalent to " rod structure " in patent document 3) Anisotropic optical film made of the anisotropic light diffusion layer stacking of window construction.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2005-265915 bulletin

Patent document 2: No. 4802707 bulletins of Japanese Patent Publication No.

Patent document 3: Japanese Unexamined Patent Publication 2012-141593 bulletin

Summary of the invention

Problems to be solved by the invention

However, in the anisotropic optical film recorded in patent document 3, due to using the anisotropy of shutter Light diffusion layer, thus while the diffusion breadth in the direction MD broadens, but there are the diffusion breadths in the direction TD not to have still sufficiently Width, be easy to happen change dramatically, dazzle such problems of the brightness in the direction TD.

Therefore, invention that the present invention was completed to solve the above problem, it is intended that providing a kind of anisotropy Optical film by obtaining straight line transmittance with high in non-diffusing regions, and expands with the direction MD and the wide of the direction TD Region is dissipated, so as to eliminate the change dramatically of brightness, generation such problems of dazzle.

The method used for solving the problem

In order to solve the above problems, the inventors of the present invention have made intensive studies, as a result, it has been found that, by making that there is rod structure Anisotropy light diffusion layer and the column with cross sectional shape smaller than the aspect ratio of shutter, bigger than the aspect ratio of rod structure The anisotropic light diffusion layer in shape region is laminated, and can take into account the high of non-diffusing regions and obtain straight line transmittance and the direction MD and TD The wide diffusion zone in direction, to complete the present invention based on such opinion.

That is, the present invention is a kind of anisotropic optical film, which is characterized in that be to be laminated with two layers or more straight line transmittance root According to the anisotropic optical film of the changed anisotropy light diffusion layer of incident light angle, aforementioned anisotropy light diffusion layer is each From the multiple cylindrical regions different from the matrix region with matrix region and refractive index, spread as aforementioned anisotropic light Layer, at least with the aspect ratio (major diameter/short of minor axis vertical with the differently- oriented directivity of aforementioned cylindrical region, in section and major diameter Diameter) different two kinds of anisotropy light diffusion layers (a) and anisotropy light diffusion layer (b), aforementioned anisotropy light diffusion layer (a) Aforementioned cylindrical region minor axis and major diameter aspect ratio less than 2, the aforementioned cylindrical region of aforementioned anisotropy light diffusion layer (b) Minor axis and major diameter aspect ratio in 2 or more and 20 or less range.

Here, it is preferred that in aforementioned anisotropy light diffusion layer (a), most by the minor axis in the section of aforementioned cylindrical region Major diameter is set as the value in 0.5~5 μ m, and the maximum diameter of major diameter is set as the value in 0.5~8 μ m, aforementioned respectively to different In property light diffusion layer (b), the value in the range of the maximum value of the minor axis in the section of aforementioned cylindrical region is set as 0.5~5 μm, Value in the range of the maximum diameter of major diameter is set as 1~40 μm.

In addition, in aforementioned anisotropic optical film, preferably aforementioned anisotropy light diffusion layer is respective, with straight line transmittance Straight line transmittance, that is, maximum linear transmitance of the light of incident light angle incidence when as maximum be 20% more than and less than 95%, also, the straight line transmittance minimum straight line of the light of incident light angle incidence when becoming minimum with straight line transmittance is saturating Crossing rate is 25% or less.

In addition, the aforementioned maximum linear of preferably aforementioned anisotropy light diffusion layer (a) is saturating in aforementioned anisotropic optical film Crossing rate is 20% more than and less than 60%, also, aforementioned minimum straight line transmittance is 20% hereinafter, aforementioned anisotropic light is spread The aforementioned maximum linear transmitance of layer (b) be 30% more than and less than 95%, also, aforementioned minimum straight line transmittance be 25% with Under.

In addition, preferably aforementioned anisotropy light diffusion layer is respectively dissipated at least one in aforementioned anisotropic optical film Mandrel is hit, if by polar angle θ (- 90 ° of < θ formed by the normal of aforementioned anisotropy light diffusion layer and aforementioned scatter central axis 90 ° of <) be set as scattering central axis angle, then the scattering central axis angle of aforementioned anisotropy light diffusion layer (a) and it is aforementioned respectively to The absolute value of the difference of the scattering central axis angle of anisotropic light diffusion layer (b) is preferably 0 ° or more and 30 ° or less.

In addition, in aforementioned anisotropic optical film, the aforementioned respective thickness of anisotropy light diffusion layer be preferably 15 μm with It is upper and 100 μm or less.

In addition, between aforesaid plurality of anisotropy light diffusion layer, can further have band in aforementioned anisotropic optical film There is the adhesion coating of the transparency.

In addition, the present invention is a kind of manufacturing method of anisotropic optical film, which is characterized in that be include to be formed it is aforementioned each Anisotropy light diffusion layer (a) formation process of anisotropy light diffusion layer (a) and the aforementioned anisotropy light diffusion layer (b) of formation Anisotropy light diffusion layer (b) formation process, obtain the manufacturer of the anisotropic optical film of above-mentioned anisotropic optical film Method, aforementioned anisotropy light diffusion layer (a) formation process has following process: the process for obtaining parallel rays from light source, and makes Light is incident to Photocurable composition layer, makes the cured process of Photocurable composition layer；Aforementioned anisotropy light diffusion layer (b) Formation process has following process: the process for obtaining parallel rays from light source makes above-mentioned parallel rays to directive property diffused component Process that is incident, obtaining the light with directive property, and make the above-mentioned light with directive property to the incidence of Photocurable composition layer, make The cured process of Photocurable composition layer.

In the manufacturing method of aforementioned anisotropic optical film, the aspect ratio of the aforementioned light with directive property be preferably in 2 with In upper and 20 or less range.

Here, the definition of the main term in patent claims and this specification is illustrated.

" region of low refractive index " and " high-refractive-index regions " is the material by constituting anisotropic optical film of the invention The region that the difference of height of the refractive index of part is formed is the term that the low or high relativity of refractive index is indicated compared with another party. These regions are formed when forming the material solidification of anisotropic optical film.

" scattering central axis " is meant that, with make the incident light angle to anisotropic optical film change the time expand Dissipating property has the consistent direction of incident light angle of light of substantially symmetric property using the incident light angle as boundary.Why " tool is set as Have substantially symmetric property ", it is because optical characteristics is (aftermentioned when scattering central axis has inclination angle relative to the normal direction of film " optical profile ") do not have proper symmetry.Scattering central axis can confirm in the following way: utilize optical microphotograph The inclination angle in the section of sem observation anisotropic optical film；Or so that incident light angle is changed and observe by anisotropic light Learn the projection of shape of the light of film.

In addition, straight line transmittance relates generally to the straight line permeability of the light to anisotropic optical film incidence, it is from a certain When incident light angle incidence, the ratio through light quantity and the light quantity of incident light of rectilinear direction, indicated by following formula.

Straight line transmittance (%)=(straight line penetrates light quantity/incident light quantity) × 100

In addition, being used to both " scattering " and " diffusion " indistinction, the two indicates identical meaning in the present invention.Into one Step, " photopolymerization " and " photocuring " is meant, photopolymerizable compound carries out polymerization reaction by light, by the two with synonymous Word uses.

Invention effect

According to the present invention, by making the anisotropy light diffusion layer for the cylindrical region for having aspect ratio less than 2 and having vertical The horizontal anisotropic light diffusion layer stacking than for 2 or more and 20 cylindrical regions below, so as to obtain taking into account non-diffusing area The anisotropic optical film of the high wide diffusion zone for obtaining straight line transmittance and the direction MD and the direction TD in domain.Therefore, Neng Gouti For following anisotropic optical film:, can in the case where such anisotropic optical film to be used as to the diffusion barrier of display panel Possess excellent display characteristic (brightness, contrast etc.), and inhibits the generation of the change dramatically of brightness, dazzle.

Detailed description of the invention

Fig. 1 is the anisotropic optical for indicating to have the cylindrical region of rod structure, shutter and intermediate structure The schematic diagram of an example of the structure of film and the appearance through light to these anisotropic optical films after incident.

Fig. 2 is the explanatory diagram for indicating the evaluation method of light diffusing of anisotropic optical film.

Fig. 3 is the incident light angle for indicating the anisotropic optical film to rod structure shown in FIG. 1 and shutter With the chart of the relationship of straight line transmittance.

Fig. 4 is the chart for illustrating diffusion zone and non-diffusing regions.

Fig. 5 is an example for indicating the overall structure of anisotropic optical film involved in the preferred embodiments of the present invention Schematic diagram.

Fig. 6 is the anisotropic light diffusion with rod structure indicated in anisotropic optical film involved in same mode The schematic diagram of an example of the composition of layer, (a) are perspective view, (b) are plan view, are (c) sectional view cut off with line C-C of (b).

Fig. 7 is the anisotropic light with intermediate structure indicated in anisotropic optical film involved in same mode The schematic diagram of an example of the composition of diffusion layer, (a) are perspective view, (b) are plan view, are (c) the cutting with line C-C cutting of (b) Face figure.

Fig. 8 is for illustrating that the three-dimensional pole of the scattering central axis in anisotropy light diffusion layer involved in same mode is sat Mark expression.

Fig. 9 is the schematic diagram for indicating the manufacturing method of anisotropy light diffusion layer (b) involved in same mode.

Figure 10 be indicate the liquid crystal display device using anisotropic optical film involved in same mode composition one The schematic diagram of example.

Figure 11 be indicate the liquid crystal display device using anisotropic optical film involved in same mode composition one The schematic diagram of example.

Figure 12 is to indicate that the direction the MD diffusion of the anisotropic optical film of embodiment and comparative example and the direction TD are spread The schematic diagram of the composition of device used in evaluation.

Figure 13 is the evaluation jumpy of the brightness for illustrating the anisotropic optical film of embodiment and comparative example The chart of method.

Specific embodiment

Hereinafter, being explained in detail on one side to the preferred embodiments of the present invention referring to attached drawing on one side.It is explained It is that in this specification and attached drawing, the constitutive requirements with the same symbol substantially have identical structure or function.

In addition, being illustrated in the following order for the anisotropic optical film of the method.

The structure and characteristic of 1 anisotropic optical film

The project of 2 prior arts and its summary of solution

The composition of anisotropic optical film involved in 3 the method

The manufacturing method of anisotropic optical film involved in 4 the method

The purposes of anisotropic optical film involved in 5 the method

" structure and characteristic of anisotropic optical film "

Firstly, referring to Fig.1~Fig. 4 on one side, on one side as the premise for illustrating anisotropic optical film involved in the method, To anisotropic optical film (anisotropic light when described " anisotropy light diffusion layer " is only one layer in the method for single layer Learn film) structure and characteristic be illustrated.Fig. 1 is the column for indicating to have rod structure, shutter and intermediate structure The structure of the anisotropic optical film of the single layer in region and the appearance through light to these anisotropic optical films after incident The schematic diagram of an example.Fig. 2 is the explanatory diagram for indicating the evaluation method of light diffusing of anisotropic optical film.Fig. 3 be indicate to The relationship of the incident light angle and straight line transmittance of the anisotropic optical film of rod structure and shutter shown in FIG. 1 Chart.Fig. 4 is the chart for illustrating diffusion zone and non-diffusing regions.

(structure of anisotropic optical film)

Anisotropic optical film refers to, on the film thickness direction of film, it is different from the matrix region of film to be formed with refractive index The film in region.The shape in the different region of refractive index is not particularly limited, for example, there is following anisotropic optical film: such as Fig. 1 (a) shown in, in matrix region 11, the folding formed with the small column of the aspect ratio of minor axis and major diameter (for example, rodlike) is formd Penetrate the anisotropic optical film (anisotropic optical film of rod structure) 10 of the different cylindrical region 13 of rate；As shown in Fig. 1 (b), In matrix region 21, the column area different with the refractive index of the big column of aspect ratio (for example, generally plate like) formation is formd The anisotropic optical film (anisotropic optical film of shutter) 20 in domain 23；As shown in Fig. 1 (c), in matrix region 31 In, form the anisotropic optical film of the cylindrical region 33 of the intermediate aspect ratio of rod structure and shutter (hereinafter referred to as " anisotropic optical film of intermediate structure ".) etc..

(characteristic of anisotropic optical film)

Anisotropic optical film with above structure is light diffusing (straight line transmittance) according to the incident light to the film The optical diffusion film different and different, that there is incident light angle interdependence of angle.About with defined incident light angle to The light of anisotropic optical film incidence, when the differently- oriented directivity in the region different from refractive index is (for example, the column area in rod structure The extending direction (differently- oriented directivity) of cylindrical region 33 in domain 13, intermediate structure, plate like region 23 in shutter Short transverse) when being substantially parallel, it is preferential to spread, it is preferential to penetrate when not parallel with the direction.

Here, the light diffusing of anisotropic optical film is further illustrated on one side referring to Fig. 2 and 3 on one side.Here, The light diffusing for enumerating the anisotropic optical film 10 of above-mentioned rod structure and the anisotropic optical film 20 of shutter carries out Explanation.

Light diffusing evaluation method is as follows carry out.Firstly, as shown in Fig. 2, anisotropic optical film 10,20 is configured at Between light source 1 and detector 2.In the method, by the irradiation light I from light source 1 from the normal side of anisotropic optical film 10,20 0 ° of incident light angle is set as to incident situation.In addition, anisotropic optical film 10,20 is configured to centered on straight line L It arbitrarily rotates, light source 1 and detector 2 are fixed.That is, sample (anisotropic optical film 10,20) can be matched according to this method It is placed between light source 1 and detector 2, is measured while making angle change using the straight line L of sample surfaces as center axis straight Into the straight line transmittance for entering detector 2 through sample.

Evaluation is for anisotropic optical film 10,20 respectively by the direction the TD (width direction of anisotropic optical film of Fig. 1 Axis) light diffusing when being selected as the straight line L of rotation center shown in Fig. 2, and the evaluation result of obtained light diffusing is shown In Fig. 3.Fig. 3 is light possessed by the anisotropic optical film shown in FIG. 1 10,20 that indicates to measure using method shown in Fig. 2 The figure of the incident light angle interdependence of diffusivity (light scattering).The longitudinal axis of Fig. 3 indicates the index as the degree for indicating scattering Straight line transmittance (in the method, when the parallel rays incidence of the light quantity as defined in make, go out in direction identical with incident direction The ratio of the light quantity for the parallel rays penetrated, more specifically, detection when straight line transmittance=have anisotropic optical film 10,20 The detection light quantity of detector 2 when the detection light quantity of device 2/without anisotropic optical film 10,20), horizontal axis is indicated to each to different The incident light angle of property optical film 10,20.Solid line in Fig. 3 indicates the light diffusing of the anisotropic optical film 10 of rod structure, Dotted line indicates the light diffusing of the anisotropic optical film 20 of shutter.Be explained, incident light angle it is positive and negative It indicates to make the contrary of the rotation of anisotropic optical film 10,20.

As shown in figure 3, anisotropic optical film 10,20 has straight line transmittance according to the changed light of incident light angle Diffusible incident light angle interdependence.Herein, below by the incident light angle interdependence as shown in Figure 3 for indicating light diffusing Curve be known as " optical profile ".Optical profile and indirect performance light diffusing, but if be construed to straight line transmittance reduce, Opposite diffusional permeability increases, it can be said that substantially indicating light diffusing.In usual isotropic optical diffusion film, show with 0 ° Nearby for peak mountain type optical profile, but in anisotropic optical film 10,20, show the optical profile of paddy type: in column The incident light angle of the direction (is set as 0 ° by central axis (thickness) direction in region 13,23, i.e. scattering center axis direction.) incident When straight line transmittance be compared, minimum is temporarily become in ± 5~10 ° of incident light angle straight line transmittances, with this Incident light angle (absolute value) becomes larger, and straight line transmittance becomes larger, and becomes in ± 45~60 ° of incident light angle straight line transmittances Maximum.As above, anisotropic optical film 10,20 have the property that incident light close to scattering center axis direction ± 5~ Spread by force within the scope of 10 ° of incident light angle, but within the scope of the incident light angle more than it diffusion weaken and straight line is saturating Cross rate raising.Hereinafter, by with maximum linear transmitance and the minimum straight line transmittance of median of straight line transmittance corresponding two The angular range of a incident light angle is known as diffusion zone (width of the diffusion zone is known as " diffusion breadth "), other than it Incident light angle range be known as non-diffusing regions (penetrating region).Here, shutter is enumerated on one side referring to Fig. 4 on one side Anisotropic optical film 20 diffusion zone and non-diffusing regions are illustrated.Fig. 4 be indicate Fig. 3 shutter it is each The figure of the optical profile of anisotropy optical film 20, as shown in figure 4, (in the example of Fig. 4, straight line is penetrated with maximum linear transmitance Rate is about that 78%) (in the example of Fig. 4, straight line transmittance is about that the straight line of median 6%) penetrates with minimum straight line transmittance (in the example of Fig. 4, straight line transmittance is about 42%) (optical profile shown in Fig. 4 between corresponding two incident light angles to rate On two stain positions two incident light angles inside) incident light angle range become diffusion zone, other than (figure The outside of two incident light angles of two stain positions in optical profile shown in 4) incident light angle range become Non-diffusing regions.

About the anisotropic optical film 10 of rod structure, if the appearance through light of observation Fig. 1 (a) just it is found that through Light be it is roughly circular, show roughly the same light diffusing in the direction MD and the direction TD.That is, the anisotropic light about rod structure Film 10 is learned, diffusion has isotropism.In addition, such as Fig. 3's is shown in solid, even if changing incident light angle, light diffusing is (especially The optical profile of the near border of non-diffusing regions and diffusion zone) variation it is also slower, therefore have and brightness do not occur Change dramatically, effect as dazzle.However, about anisotropic optical film 10, if blinds shown in dotted line with Fig. 3 The optical profile of the anisotropic optical film 20 of window construction is compared just it is found that the straight line transmittance in non-diffusing regions is low, Therefore display characteristic (brightness, contrast etc.) also can slightly reduces such problems.In addition, the anisotropic optical of rod structure Film 10 is compared with the anisotropic optical film 20 of shutter, and there are also the narrow such problems of the width of diffusion zone.

On the other hand, about the anisotropic optical film of shutter 20, if the sample through light of observation Fig. 1 (b) Son just it is found that through light become it is substantially needle-shaped, differ widely in the direction MD and the direction TD light diffusing.That is, about shutter knot The anisotropic optical film 20 of structure, diffusion have anisotropy.Specifically, in example shown in FIG. 1, in the direction MD and column knot The case where structure, broadens compared to diffusion, spreads and narrows compared with the case where direction TD is with rod structure.In addition, as is shown in phantom in fig. 3, If changing incident light angle, (the case where the method is the direction TD) light diffusing (especially non-diffusing regions and diffusion zone Near border optical profile) variation it is extremely precipitous, therefore anisotropic optical film 20 is being suitable for display device In the case of, in fact it could happen that the change dramatically of brightness, dazzle, having makes the visual danger reduced.In addition to this, shutter There is also interference (rainbow) such problems for being easy to produce light for anisotropic optical film.However, about anisotropic optical film 20, There is the straight line transmittance in non-diffusing regions high, display characteristic can be made to improve such effect.

" project of the prior art and its summary of solution "

Next, the summary of project and its solution to anisotropic optical film in the prior art is illustrated.

(project of the prior art)

Only single layer had into the anisotropy light diffusion layer containing rod structure or shutter as explained above Anisotropic optical film in the case where display device, the width of straight line transmittance, diffusion zone in non-diffusing regions Degree, the diffusion breadth in the direction TD (or the direction MD), the change dramatically of brightness, the presence or absence of the generation of dazzle etc. consider, existing Strong point has weak points again.That is, the inventors of the present invention have found following project: having the anisotropic light diffusion containing rod structure about only single layer The anisotropic optical film of layer, anisotropy light diffusion layer containing shutter, by the straight line transmittance in non-diffusing regions Diffusion zone (diffusion breadth) upward, on the direction TD (or the direction MD) expansion and brightness change dramatically and dazzle The inhibition of generation have both in high level and balancedly and be difficult.

In this regard, also have makes rod structure (be equivalent to " cylinder in patent document 3 as recording in above patent document 3 Structure ") anisotropy light diffusion layer and shutter anisotropic light diffusion layer stacking made of anisotropic optical Film.However, anisotropy light diffusion layer and shutter for as described in Patent Document 3, simply just making rod structure Anisotropic optical film made of the stacking of anisotropic light diffusion layer, due to having used the anisotropic light of shutter to spread Layer, therefore there are the diffusion breadths in the direction MD to broaden, but the diffusion breadth in the direction TD does not have sufficient width still, is easy hair Change dramatically, dazzle such problems of the brightness in the raw direction TD.Therefore, for anisotropic optical as patent document 3 Film, by the diffusion zone (diffusion breadth) on the raising of the straight line transmittance in non-diffusing regions, the direction TD (or the direction MD) Expand and the inhibition of the generation of the change dramatically and dazzle of brightness is had both in high level and balancedly and is also difficult.

(summary of the project solution of the prior art)

In order to solve such project, the inventors of the present invention are had made intensive studies to obtain the straight line in non-diffusing regions The raising of transmitance, expansion and the brightness of diffusion zone (diffusion breadth) on the direction TD (or the direction MD) change dramatically with And the inhibition of the generation of dazzle is in anisotropic optical film that is high-level and balancedly having both.Itself as a result, it has been found that, as patent text It offers as being recorded in 3, simply just expands the anisotropic light of rod structure (being equivalent to " cylindrical structure " in patent document 3) Dissipate layer and shutter the stacking of anisotropic light diffusion layer be it is insufficient, pass through the anisotropic light for making that there is rod structure Diffusion layer and the anisotropy with the intermediate structure with particular aspect ratio (aspect ratio bigger than column and smaller than shutter) Light diffusion layer stacking, can obtain the expansion on the raising of the straight line transmittance in non-diffusing regions, the direction TD (or the direction MD) Dissipate region (diffusion breadth) expansion and brightness change dramatically and dazzle generation inhibition high level and balancedly The anisotropic optical film having both.Therefore, by the way that such anisotropic optical film is used for the displays such as liquid crystal display device dress It sets, is able to maintain excellent display characteristic (brightness, contrast etc.), and be able to suppress the hair of the change dramatically of brightness, dazzle It is raw.Hereinafter, anisotropic optical film involved in the method completed based on these discoveries is described in detail.

" composition of anisotropic optical film involved in the method "

On one side referring to Fig. 5~Fig. 7, the composition of anisotropic optical film 100 involved in the method is illustrated on one side. Fig. 5 is the schematic diagram for indicating an example of the overall structure of anisotropic optical film 100 involved in the method.Fig. 6 is to indicate this The schematic diagram of an example of the composition of the anisotropy light diffusion layer 110 in anisotropic optical film 100 involved in mode, (a) It is (b) plan view of cylindrical region for perspective view, (c) sectional view to be cut off with the line C-C of (b).Fig. 7 is to indicate the method The schematic diagram of an example of the composition of the anisotropy light diffusion layer 120 in related anisotropic optical film 100, (a) are vertical Body figure (b) is plan view, (c) sectional view to be cut off with the line C-C of (b).

< is integrally formed >

As shown in figure 5, anisotropic optical film 100 is that straight line transmittance is each according to changed two layers of incident light angle The anisotropic optical film that anisotropy light diffusion layer 110,120 is laminated.Anisotropy light diffusion layer 110,120 respectively has Matrix region 111,121 and refractive index multiple cylindrical regions 113,123 different from the matrix region.In addition, anisotropic light It is short in the section vertical with the differently- oriented directivity of cylindrical region 113,123 in diffusion layer 110 and anisotropy light diffusion layer 120 Diameter is different from aspect ratio (=major diameter/minor axis) of major diameter.That is, in anisotropic optical film according to the present invention, as it is each to Anisotropic light diffusion layer needs at least to have osculant with above-mentioned with the above-mentioned anisotropy light diffusion layer (a) with rod structure The anisotropy light diffusion layer (b) of structure.Anisotropic optical film 100 involved in the method, as above-mentioned anisotropic light Diffusion layer (a) has and is laminated in the anisotropy light diffusion layer 110 of upper layer side, as above-mentioned anisotropy light diffusion layer (b), With the anisotropy light diffusion layer 120 for being laminated in lower layer side.Only, in the present invention, anisotropy light diffusion layer (a) and each The lamination order of anisotropy light diffusion layer (b) is not particularly limited, and anisotropy light diffusion layer 110 can also involved in the method It is laminated in lower layer side, anisotropy light diffusion layer 120 can also be laminated in upper layer side.It is explained, in the method, shows Go out to be laminated with the composition of two layers of anisotropy light diffusion layer, but as anisotropic optical film according to the present invention, it can also Three layers of stacking or more anisotropy light diffusion layer.

In addition, being further laminated with the adhesion coating with the transparency between each anisotropy light diffusion layer 110,120 130.As long as the adhesion coating 130 is set as needed.Here, there are three layers or more anisotropy in anisotropic optical film In the case where light diffusion layer, there can be adhesion coating between whole anisotropy light diffusion layers, it can also be only in a part of anisotropy There is adhesion coating between light diffusion layer, whole anisotropy light diffusion layers can also without adhesion coating be laminated.

110 > of < anisotropy light diffusion layer

Anisotropy light diffusion layer 110 has similarly to be constituted with above-mentioned single layer anisotropic optical film 10, has straight line Transmitance is according to the changed light diffusing of incident light angle.In addition, anisotropy light diffusion layer 110 is by including optical polymerism The solidfied material of the composition of compound is formed, as shown in fig. 6, having matrix region 111 and refractive index and the matrix region 111 Different multiple cylindrical regions 113.Differently- oriented directivity (extending direction) P of the cylindrical region 113 is with parallel with scattering central axis Mode is formed, and can is suitable for being chosen to be so that anisotropy light diffusion layer 110 has desired straight line transmittance and diffusion Property.It is explained, scattering central axis refers to the differently- oriented directivity of cylindrical region to be parallel, as long as meeting the law of refractive index (Si Nieer (Snell) law), without strictly parallel.About Snell law, when light is from refractive index n₁Medium to refraction Rate n₂Medium interface incidence when, in its incident light angle θ₁With refraction angle θ₂Between, n₁sinθ₁=n₂sinθ₂Relationship at It is vertical.For example, if being set as n₁=1 (air), n₂=1.51 (anisotropic optical films), then when the inclination angle of scattering central axis is (incident Angular) be 30 ° when, the differently- oriented directivity (refraction angle) of cylindrical region is about 19 °, in this way, even if incident light angle and refraction angle Difference is included in parallel concept as long as meeting Snell law in the method.

In addition, as anisotropy light diffusion layer 110, the differently- oriented directivity of cylindrical region 113 and the film thickness direction (normal of film Direction) it is inconsistent can also.In this case, had the property that in anisotropy light diffusion layer 110 incident light with from normal The close incident light angle range (diffusion region in the direction (that is, differently- oriented directivity of cylindrical region 113) of direction inclination predetermined angular Domain) it is spread by force, incident light angle range (non-diffusing regions) diffusion more than it dies down and straight line transmittance is got higher.

(cylindrical region 113)

Cylindrical region 113 involved in the method is arranged in matrix region 111 as multiple columnar consolidation zones, Each cylindrical region 113 is formed with being individually oriented the direction mode parallel with scattering central axis.Therefore, same anisotropic light expands The multiple cylindrical regions 113 dissipated in layer 110 are formed in a manner of being parallel to each other.

As long as the refractive index of matrix region 111 is different from the refractive index of cylindrical region 113, the different degree of refractive index It is not particularly limited, is relativity.In the case where the refractive index of matrix region 111 is lower than the refractive index of cylindrical region 113, Matrix region 111 becomes region of low refractive index.On the contrary, the refractive index in matrix region 111 is higher than the refractive index of cylindrical region 113 In the case where, matrix region 111 becomes high-refractive-index regions.

Shown in the cross sectional shape vertical with the differently- oriented directivity of cylindrical region 113 such as Fig. 6 (b), there is minor axis SA and major diameter LA. Minor axis SA and major diameter LA can be confirmed (reference plane and observing anisotropy light diffusion layer 110 with optical microscopy Figure).As long as the cross sectional shape of cylindrical region 113 meets the range (less than 2) of aftermentioned aspect ratio, it is not particularly limited. For example, illustrating the cross sectional shape of cylindrical region 113 with circle, but the cross sectional shape of cylindrical region 113 is not limited to justify in Fig. 6 Shape can be ellipse, polygon, unsetting, their shapes mixed in together, be not particularly limited.

The aspect ratio (=LA/SA) of minor axis SA and major diameter LA needs to meet less than 2.Thereby, it is possible to realize anisotropic light Learn the raising of the straight line transmittance in the non-diffusing regions of film 100 and the expansion of diffusion zone (diffusion breadth).In order to more effective The effect is realized on ground, and the aspect ratio of the minor axis SA in the section of cylindrical region 113 and major diameter LA are preferably smaller than 1.5, more preferably small In 1.2.

In addition, the length of the minor axis SA in the section of cylindrical region 113 is (in the minor axis SA of multiple cylindrical regions 113 most Major diameter) lower limit value be preferably 0.5 μm, more preferably 1.0 μm, further preferably 1.5 μm or more.As minor axis SA shortens, The danger for thering is the diffusivity of light, light-gathering to become inadequate.On the other hand, the length of the minor axis SA in the section of cylindrical region 113 The upper limit value for spending (maximum diameter in the minor axis SA of multiple cylindrical regions 113) is preferably 5.0 μm, and more preferably 3.0 μm, further Preferably 2.5 μm.As minor axis SA is elongated, the danger for thering is range of scatter to narrow.The lower limit of the minor axis SA of these cylindrical regions 113 Value and upper limit value can carry out proper combination.For example, by the way that the minor axis SA of cylindrical region 113 is set as 0.5 μm~5.0 μm, thus Range of scatter can be made to broaden, and the diffusivity of light, light-gathering is made to become abundant.

Further, the length of the major diameter LA in the section of cylindrical region 113 is (in the major diameter LA of multiple cylindrical regions 113 Maximum diameter) lower limit value be preferably 0.5 μm, more preferably 1.0 μm, further preferably 1.5 μm or more.As major diameter LA becomes Danger that is small, thering is range of scatter to narrow.On the other hand, length (multiple column areas of the major diameter LA in the section of cylindrical region 113 Maximum diameter in the major diameter LA in domain 113) upper limit value be preferably 8.0 μm, more preferably 3.0 μm, further preferably 2.5 μm. As major diameter LA becomes larger, diffusible variation when having range of scatter that may narrow, changing incident light angle becomes extremely precipitous And it is easy to happen the danger of dazzle.In addition, if major diameter LA becomes larger, then also there is the danger for the interference (rainbow) for being easy to happen light.This The lower limit value and upper limit value of the major diameter LA of a little cylindrical regions 113 can carry out proper combination.For example, by by cylindrical region 113 Major diameter LA is set as 0.5 μm~8.0 μm, so as to make range of scatter broaden, and can eliminate when changing incident light angle Diffusible the problem of becoming extremely precipitous and being easy to happen dazzle.

In addition, the maximum value of the minor axis SA about the cylindrical region 113 in the method, the maximum value of major diameter LA, as long as Using the surface of micro- sem observation anisotropic light diffusion layer 110, optional 10 minor axis SA, major diameter LA are seen It examines, finds out their maximum value.In addition, the aspect ratio as cylindrical region 113, most using the above-mentioned major diameter LA found out Big value is worth obtained by the maximum value divided by minor axis SA.

(thickness of layer)

The thickness T of anisotropy light diffusion layer 110 is preferably 15 μm or more and 100 μm or less.By the way that thickness T is set as Range is stated, so that cost problem is reduced, and the contrast of image becomes abundant.Further, anisotropy light diffusion layer 110 The lower limit value of thickness T is more preferably 20 μm or more.As thickness T becomes smaller, the danger for thering is the diffusivity of light, light-gathering to become inadequate Danger.On the other hand, the upper limit value of the thickness T of anisotropy light diffusion layer 110 is more preferably 70 μm or less.As thickness T becomes larger, Lead to the problem of fee of material become it is more, manufacture on need the costs such as time to get higher, and have because the direction thickness T diffusion become mostly due to Image is easy to happen the fuzzy danger to make contrast be easily reduced.Under the thickness T of these anisotropy light diffusion layers 110 Limit value and upper limit value can carry out proper combination.

In Fig. 6 (c), the upper surface 110a and lower surface 110b of anisotropy light diffusion layer 110 are illustrated.Upper surface 110a With the setting that lower surface 110b is on convenient, if anisotropy light diffusion layer 110 turned over, can exchange (lower surface and Upper surface).It is preferred that the surface shape of the upper surface 110a and lower surface 110b of anisotropy light diffusion layer 110 are different.As a result, originally Anisotropic optical film 100 involved in mode can be such that the interference (rainbow) of light reduces.By by with light irradiation Mutually separation forms matrix region 111 and cylindrical region 113, so as to make the surface shape of upper surface 110a and following 110b not Together.In addition, having in upper surface 110a or lower surface 110b if making anisotropy light diffusion layer 110 by mutually separating Either the case where optical microscopy is observed is difficult to be utilized.This is because from the slow facing towards the direction thickness T of irradiation light It is slow to form cylindrical region 113, but after cylindrical region 113 reaches another side (opposing face in the face of irradiation light), cylindrical region 113 just further elongations.In this case, by the face using optical microphotograph sem observation another party, to become easy Confirm cylindrical region 113.

In the present invention preferably, along the direction thickness T (Z-direction) of one layer of anisotropy parameter layer 110,113 He of cylindrical region The interface of matrix region 111, which has, does not interrupt and the composition of continued presence.By making cylindrical region 113 and matrix region 111 Interface has continuous composition, so that the diffusion of light and optically focused become easy continuous production when passing through anisotropy light diffusion layer 110 Raw, the diffusion of light and the efficiency of optically focused improve.On the other hand, if in the section of anisotropy light diffusion layer 110, column area Domain 113 and matrix region 111 are main to be existed mottledly as spot, then is difficult to obtain light-gathering, therefore not preferred.

120 > of < anisotropy light diffusion layer

Anisotropy light diffusion layer 120 has similarly to be constituted with the anisotropic optical film 30 of above-mentioned single layer, is had straight Line transmitance is according to the changed light diffusing of incident light angle.In addition, as shown in fig. 7, anisotropy light diffusion layer 120 by The solidfied material of composition comprising photopolymerizable compound is formed, and has matrix region 121 and refractive index and the matrix region 121 Different multiple cylindrical regions 123.Multiple cylindrical regions 123 and matrix region 121 have irregular distribution, shape, along each The whole face of anisotropy light diffusion layer 120 is formed, thus resulting optical characteristics (for example, straight line transmittance etc.) any position into Row measurement is substantially the same.Multiple cylindrical regions 123 and matrix region 121 have irregular distribution, shape, therefore the method The interference (rainbow) of the light of related anisotropy light diffusion layer 120 occurs few.About such structure, detailed content will after the meeting It states, for example, can be dissipated from light source to piece irradiation with desired by that will include that slabbing is arranged in the composition of photopolymerizable compound The parallel light of mandrel is hit, composition is solidified to form, the part of irradiation light becomes cylindrical region 123, non-irradiation light The part of line becomes matrix region 121.

(cylindrical region 123)

Cylindrical region 123 involved in the method is arranged in matrix region 121 as multiple columnar consolidation zones, Each cylindrical region 123 is formed with being individually oriented direction with scattering central axis as parallel mode.Therefore, same anisotropy Multiple cylindrical regions 123 are formed in a manner of being parallel to each other in light diffusion layer 120.

As long as the refractive index of matrix region 121 is different from the refractive index of cylindrical region 123, the different degree of refractive index It is not particularly limited, is relativity.In the case where the refractive index of matrix region 121 is lower than the refractive index of cylindrical region 123, Matrix region 121 becomes region of low refractive index.On the contrary, the refractive index in matrix region 121 is higher than the refractive index of cylindrical region 123 In the case where, matrix region 121 becomes high-refractive-index regions.Here, it is preferred that the interface of matrix region 121 and cylindrical region 123 In refractive index increasingly change.By increasingly changing, thus diffusible change when being not susceptible to change incident light angle The problem of change becomes extremely precipitous and is easy to happen dazzle.By forming matrix region by the mutually separation with light irradiation 121 and cylindrical region 123, so as to change the refractive index at matrix region 121 and the interface of cylindrical region 123 increasingly.

Shown in the cross sectional shape vertical with the differently- oriented directivity of cylindrical region 123 such as Fig. 7 (b), there is minor axis SA and major diameter LA. Minor axis SA and major diameter LA can be confirmed (reference plane and using optical microphotograph sem observation anisotropic light diffusion layer 120 Figure).As long as the cross sectional shape of cylindrical region 123 meets the range (2 or more and 20 or less) of aftermentioned aspect ratio, without spy It does not limit.For example, illustrating the cross sectional shape of cylindrical region 123, but the cross sectional shape of cylindrical region 123 with ellipse in Fig. 7 It is not limited to ellipse, can be polygon, wavy, unsetting, their shapes mixed in together etc., be not particularly limited.

In addition, shown in the cross sectional shape of the differently- oriented directivity of cylindrical region 123 such as Fig. 7 (c), cylindrical region 123 and matrix area Domain 121 is formed in an alternating fashion.In Fig. 7 (c), shape of the cylindrical region 123 in the direction of thickness T linearly to extend is shown State, but can also be linear, wavy or bending, it can also be their forms mixed in together.

The aspect ratio (=LA/SA) of minor axis SA and major diameter LA is necessary for 2 or more and 20 or less.As a result, in anisotropic light It learns in film 100, can be realized the high wide diffusion region obtained in straight line transmittance and the direction MD and the direction TD in non-diffusing regions It takes into account in domain.In addition, in the section of cylindrical region 123 minor axis SA and the aspect ratio of major diameter LA become smaller, have straight line transmission The danger that the maximum linear transmitance under incident light angle when rate becomes maximum is lower, therefore in the method, cylindrical region 123 Aspect ratio be set as 2 or more.On the other hand, the upper limit value of the aspect ratio of minor axis SA and major diameter LA is preferably 10 hereinafter, more preferably It is 5 or less.As aspect ratio becomes larger, the danger that there is the range of scatter of light to narrow.Additionally, there are aspect ratios to become bigger, more holds The problem of interference (rainbow) of light easily occurs.The lower limit value and upper limit value of these aspect ratios can carry out proper combination.For example, pass through by The aspect ratio of cylindrical region 123 is set as 2~20, and the range of scatter of anisotropic optical film 100 can be made to broaden, and is not easy to send out The problem of variation of brightness when raw change incident light angle becomes extremely precipitous and is easy to happen dazzle.

In addition, the length of the minor axis SA in the section of cylindrical region 123 is (in the minor axis SA of multiple cylindrical regions 123 most Major diameter) lower limit value be preferably 0.5 μm, more preferably 1.0 μm, further preferably 1.5 μm or more.As minor axis SA shortens, The danger for thering is the diffusivity of light, light-gathering to become inadequate.On the other hand, the length of the minor axis SA in the section of cylindrical region 123 The upper limit value for spending (maximum diameter in the minor axis SA of multiple cylindrical regions 123) is preferably 5.0 μm, and more preferably 3.0 μm, further Preferably 2.5 μm.As minor axis SA is elongated, the danger for thering is range of scatter to narrow.The lower limit of the minor axis SA of these cylindrical regions 123 Value and upper limit value can carry out proper combination.For example, by the way that the minor axis SA of cylindrical region 123 is set as 0.5 μm~5.0 μm, it can So that range of scatter is broadened, and keeps the diffusivity of light, light-gathering abundant.

Further, the length of the major diameter LA in the section of cylindrical region 123 is (in the major diameter LA of multiple cylindrical regions 123 Maximum diameter) lower limit value be preferably 1.0 μm.As major diameter LA becomes smaller, the danger for thering is the range of scatter in the direction MD to narrow.Another party Face, the upper limit of the length (maximum diameter in the major diameter LA of multiple cylindrical regions 123) of the major diameter LA in the section of cylindrical region 123 Preferably 40 μm of value, more preferably 20 μm, further preferably 10 μm.As major diameter LA becomes larger, there is the range of scatter in the direction TD Diffusible variation when narrowing, changing incident light angle becomes danger that is extremely precipitous and being easy to happen dazzle.In addition, if Major diameter LA becomes larger, and also has the danger for the interference (rainbow) for being easy to happen light.The lower limit value of the major diameter LA of these cylindrical regions 123 and upper Limit value can carry out proper combination.For example, by the way that the major diameter LA of cylindrical region 123 is set as 1.0 μm~40 μm, so as to make to expand Scattered range broadens, and the variation of brightness when being not susceptible to change incident light angle becomes extremely precipitous and is easy to happen dazzle The problem of.

In addition, the maximum value of the minor axis SA about the cylindrical region 123 in the method, the maximum value of major diameter LA, as long as Using the section of micro- sem observation anisotropic light diffusion layer 120, optional 10 minor axis SA, major diameter LA are seen It examines, finds out their maximum value.In addition, the aspect ratio as cylindrical region 123, most using the above-mentioned major diameter LA found out Big value is worth obtained by the maximum value divided by minor axis SA.

(thickness of layer)

The thickness T of anisotropy light diffusion layer 120 is preferably 15 μm or more and 100 μm or less.By the way that thickness T is set as Range is stated, to reduce the problem of cost, and the contrast of image becomes abundant.Further, anisotropy light diffusion layer 120 The lower limit value of thickness T be more preferably 20 μm or more.As thickness T becomes smaller, there are the diffusivity of light, light-gathering to become inadequate It is dangerous.On the other hand, the upper limit value of the thickness T of anisotropy light diffusion layer 120 is more preferably 70 μm or less.As thickness T becomes Greatly, lead to the problem of fee of material become it is more, manufacture on need the costs such as time to get higher, and because the direction thickness T diffusion become More and image is easy to happen fuzzy thus the danger for being easily reduced contrast.The thickness T of these anisotropy light diffusion layers 120 Lower limit value and upper limit value can carry out proper combination.

In addition, with above-mentioned anisotropy light diffusion layer 110 the case where is same for other aspects, thus omit here detailed It describes in detail bright.

< straight line transmittance >

What anisotropy light diffusion layer 110 was comparable to have rod structure as described above (has column of the aspect ratio less than 2 Region) layer, that is, anisotropy light diffusion layer (a) layer.Here, if by angle of incident light when becoming maximum with straight line transmittance It spends to the straight line transmittance of the incident light of anisotropy light diffusion layer 110 and is defined as " maximum linear transmitance ", then anisotropy The maximum linear transmitance of light diffusion layer 110 is preferably 20% more than and less than 60%.The maximum of anisotropy light diffusion layer 110 The upper limit value of straight line transmittance is more preferably 30% or less.On the other hand, the maximum linear of anisotropy light diffusion layer 110 penetrates The lower limit value of rate is more preferably 50% or more.

In addition, if incident light angle when becoming minimum with straight line transmittance is entered to anisotropy light diffusion layer 110 The straight line transmittance for the light penetrated is defined as " minimum straight line transmittance ", then the minimum straight line of anisotropy light diffusion layer 110 penetrates Rate is preferably 20% or less.The upper limit value of the minimum straight line transmittance of anisotropy light diffusion layer 110 is more preferably 10% or less. Minimum straight line transmittance is lower, indicates that straight line reduces (haze value increase) through light quantity.Therefore, minimum straight line transmittance is lower, Indicate that diffusion light quantity increases.The minimum straight line transmittance of anisotropy light diffusion layer 110 is preferably low.There is no limit for lower limit value, For example, 0%.

Anisotropy light diffusion layer 120 as described above, be comparable to have intermediate structure (have aspect ratio be 2 with Cylindrical region in upper and 20 or less range) layer, that is, anisotropy light diffusion layer (b) layer.It here, if will be saturating with straight line The incident light angle that rate is crossed when becoming maximum is defined as " most to the straight line transmittance of the incident light of anisotropy light diffusion layer 120 Big straight line transmittance ", then the maximum linear transmitance of anisotropy light diffusion layer 120 is preferably 30% more than and less than 95%. The upper limit value of the maximum linear transmitance of anisotropy light diffusion layer 120 is more preferably 80% hereinafter, further preferably 70% Below.On the other hand, the lower limit value of the maximum linear transmitance of anisotropy light diffusion layer 120 is more preferably 40% or more, into One step is preferably 50% or more.

In addition, if incident light angle when becoming minimum with straight line transmittance is entered to anisotropy light diffusion layer 120 The straight line transmittance for the light penetrated is defined as " minimum straight line transmittance ", then the minimum straight line of anisotropy light diffusion layer 120 penetrates Rate is preferably 25% or less.The upper limit value of the minimum straight line transmittance of anisotropy light diffusion layer 120 be more preferably 20% hereinafter, Further preferably 15% or less.The minimum straight line transmittance and anisotropy light diffusion layer 110 of anisotropy light diffusion layer 120 It is preferably again low.There is no limit for example, 0% for lower limit value.

By the way that anisotropy light diffusion layer 110 (is equivalent to the relatively high anisotropy light diffusion layer of straight line transmittance (a)) and the maximum of anisotropy light diffusion layer 120 (being equivalent to the relatively strong anisotropy light diffusion layer (b) of diffusion strength) is straight Line transmitance and minimum straight line transmittance are set as above range, thus in anisotropic optical film 100, it can be by non-diffusing Straight line transmittance in region further increases, by diffusion zone (diffusion breadth) further expansion.It is further possible to make to change The change dramatically of brightness when incident light angle, dazzle are less susceptible to occur.In addition to this, due to that can be set as appropriate each to different Property, therefore the scope of application of anisotropic optical film 100 can be expanded.For example, being used to show by anisotropic optical film 100 In the case where device, if anisotropy is too strong, it is extremely excellent to there is the diffusion of light to the direction MD, light-gathering, but to TD The diffusion of the light in direction, light-gathering are easy the problem of becoming inadequate.Anisotropic optical film 100 involved in the method passes through With above-mentioned maximum linear transmitance, to maintain the diffusion to the excellent light in the direction MD, light-gathering, and sufficiently have to The diffusion of the light in the direction TD, light-gathering.

Here, straight line can be measured through light quantity and straight line transmittance by method shown in Fig. 2.That is, by making Fig. 2 Shown in rotary shaft L it is consistent with C-C axis shown in Fig. 6 (b) and Fig. 7 (b), each incident light angle measurement straight line penetrate light quantity And straight line transmittance (normal direction is set as 0 °).It can get optical profile from resulting data, can be asked from the optical profile Maximum linear transmitance and minimum straight line transmittance out.

In addition, the maximum linear transmitance and minimum straight line transmittance in anisotropy light diffusion layer 110,120 are available Design parameters when manufacture adjust.As the example of parameter, when can enumerate the composition of film, the film thickness of film, structure formation The temperature etc. that film is given.The composition of film selects constituent to deploy by being suitable for, thus maximum linear transmitance and Minimum straight line transmittance changes.About design parameters, film thickness is thicker, and maximum linear transmitance and minimum straight line transmittance are got over It is easy to be lower, it is thinner, it is easier to get higher.Temperature is higher, maximum linear transmitance and it is minimum straight line transmittance is easier is lower, more It is low, it is easier to get higher.By combining these parameters, maximum linear transmitance and minimum straight line transmittance can be fitted respectively Preferably adjust.

By the above method, find out each anisotropy light diffusion layer (in the method, anisotropy light diffusion layer 110, 120) maximum linear transmitance and minimum straight line transmittance, and find out maximum linear transmitance and minimum straight line transmittance The straight line transmittance of median.Production becomes the straight line of the straight line transmittance of the median in optical profile, finds out the straight line Two intersection points intersected with optical profile read incident light angle corresponding with the intersection point.In optical profile, normal direction is set It is 0 °, incident light angle is indicated with negative direction and positive direction.Therefore, incident light angle and incident light angle corresponding with intersection point Sometimes there is negative value.If the value of two intersection points has positive angle of incident light angle value and negative angle of incident light angle value, negative enters The sum of the absolute value of shooting angle value and positive angle of incident light angle value become angular range (the diffusion width of the diffusion zone of incident light Degree).In the case where the value of two intersection points is positive, the difference that the larger value subtracts smaller value becomes the diffusion breadth of incident light.? It in the case that the value of two intersection points is negative, respectively takes absolute value, the difference that the larger value subtracts smaller value becomes the diffusion of incident light Width.

It is saturating with the straight line of maximum linear transmitance and the median of minimum straight line transmittance in anisotropic optical film 100 The angular range i.e. width of diffusion zone (diffusion breadth) of corresponding two incident light angles of rate is crossed in the direction MD and the direction TD Both direction be both preferably 20 ° or more.If the angular range of the range of scatter of the incident light is easy to happen less than 20 ° The change dramatically of brightness, dazzle.In order to improve the change dramatically of brightness, the inhibitory effect of dazzle, on the direction MD and the direction TD Diffusion breadth be more preferably 30 ° or more, further preferably 40 ° or more.On the other hand, the diffusion in the direction MD or the direction TD is wide The upper limit value of degree is not particularly limited, but if may then damage light-gathering more than 60 °.

< scattering central axis >

Next, being said on one side to the scattering central axis P in anisotropy light diffusion layer 110,120 referring to Fig. 8 on one side It is bright.Fig. 8 is for illustrating that the three-dimensional polar of the scattering central axis P in anisotropy light diffusion layer 110,120 is expressed.

Anisotropy light diffusion layer 110,120 respectively has at least one scattering central axis, the meaning of the scattering central axis It is, as described above, being entered with light diffusing when making the incident light angle to anisotropy light diffusion layer 110,120 change with this Shooting angle is the consistent direction of incident light angle for the light that boundary has substantially symmetric property.Be explained, by it is each to The optical profile of anisotropic light diffusion layer 110,120 is measured, and incident light angle at this time becomes in the optical profile Substantially central portion (central portion of diffusion zone) in minimum.

In addition, the such three-dimensional polar expression according to figure 8 of above-mentioned scattering central axis, if by anisotropic light The surface of diffusion layer 110,120 is set as x/y plane, and normal is set as z-axis, then can utilize polar angle θ and azimuthTo indicate. That is, the P in Fig. 8_xyIt can refer to the length side for being projected on the scattering central axis on surface of above-mentioned anisotropy light diffusion layer 110,120 To.

Here, if by the normal (z-axis shown in Fig. 8) of anisotropy light diffusion layer 110,120 and scattering central axis P institute At polar angle θ (- 90 ° of 90 ° of < θ <) be defined as the scattering central axis angle in the method, then anisotropy light diffusion layer 110 The scattering central axis angle and anisotropy light diffusion layer 120 of (being equivalent to the anisotropy light diffusion layer (a) with rod structure) The absolute value of the difference of the scattering central axis angle of (being equivalent to the anisotropy light diffusion layer (b) with intermediate structure) is preferably 0 ° or more and 30 ° or less.By the way that the absolute value of the difference of scattering central axis angle is set as above range, so as to do not make it is each to Straight line transmittance in the non-diffusing regions of anisotropic optical film 100 reduces ground, by the width further expansion of diffusion zone.In order to More effectively realize that the effect, the scattering central axis angle and anisotropic light of more preferable anisotropy light diffusion layer 110 are spread Layer 120 scattering central axis angle absolute value of the difference be 0 ° or more and 20 ° hereinafter, further preferably 10 ° or more and 20 ° with Under.It is explained, the scattering central axis angle of anisotropy light diffusion layer 110,120 can be by changing when manufacturing them Desired angle is adjusted to the direction of the light of the composition irradiation comprising photopolymerizable compound of sheet.In addition, closing In the positive and negative of scattering central axis angle, relative to by right as defined on the face direction of anisotropy light diffusion layer 110,120 Claim axis (for example, by the axis in the direction MD of the center of gravity of anisotropy light diffusion layer 110,120) and anisotropy light diffusion layer 110, the plane of both 120 normals, the case where scattering central axis is favoured side is defined as+, the other side will be favoured The case where be defined as-.

In addition, other than the absolute value of the difference of above-mentioned scattering central axis angle (polar angle) is met the above range, respectively to different Property light diffusion layer 110 scattering central axis azimuth and anisotropy light diffusion layer 120 scattering central axis azimuth it Absolute value of the difference is preferably 0 ° or more and 20 ° or less.Thereby, it is possible to not make in the non-diffusing regions of anisotropic optical film 100 Straight line transmittance reduce ground, by the width further expansion of diffusion zone.

Here, the column area that can have multiple inclination angles different in each comfortable simple layer of anisotropy light diffusion layer 110,120 Domain group (set of the cylindrical region with identical inclination angle).In this way, with the cylindrical region that multiple inclination angles are different in simple layer In the case where group, corresponding with the inclination angle of each cylindrical region group, scattering central axis also becomes multiple.With multiple scattering central axis In the case where, as long as at least one scattering central axis in these multiple scattering central axis meets above-mentioned scattering central axis angle Condition.For example, in the tool of anisotropy light diffusion layer 110, there are two scattering central axis P1, P2, anisotropy light diffusion layers 120 tools there are two in the case where scattering central axis P3, P4, the scattering central axis angle of either one preferably in P1 and P2 with The absolute value of the difference of the scattering central axis angle of either one in P3 and P4 is 0 ° or more and 30 ° or less.The scattering center The lower limit of the absolute value of the difference of shaft angle degree is more preferably 5 °.On the other hand, the upper limit of the absolute value of the difference of scattering central axis angle More preferably 20 °, further preferably 15 °.

In addition, the polar angle θ of the scattering central axis P of each anisotropy light diffusion layer 110,120 is (that is, scattering center shaft angle Degree) preferably ± 10~60 °, more preferably ± 30~45 °.It, can not when scattering central axis angle is greater than -10 ° and is less than+10 ° Improve the contrast of the display panel including liquid crystal display device, brightness sufficiently.On the other hand, in scattering center shaft angle In the case that degree is greater than+60 ° or is less than -60 °, need to include photopolymerizable compound to setting slabbing in manufacturing process Composition is from high inclination-angle irradiation light, and the absorption efficiency of irradiation light is poor and manufacture is upper unfavorable, therefore not preferably.

< refractive index >

Anisotropy light diffusion layer 110,120 is layer made of solidifying comprising the composition of photopolymerizable compound, is made For the composition, following combination can be used.

(1) using the substance of aftermentioned independent photopolymerizable compound

(2) it is used in mixed way the substance of aftermentioned a variety of photopolymerizable compounds

(3) independent or a variety of photopolymerizable compounds and high-molecular compound without optical polymerism are used in mixed way Substance

Speculate for any of the above-described combination, is radiated in anisotropy light diffusion layer 110,120 by light, is respectively formed refraction The different micron-sized fine structure of rate, it is believed that thus show anisotropic light special shown in the method and spread spy Property.Therefore, in above-mentioned (1), the variations in refractive index preferably before and after photopolymerization is big, in addition, preferably combining refractive index not in (2), (3) Same multiple material.It is explained, variations in refractive index, refringence here refers to, is particularly shown 0.01 or more, preferably 0.05 or more display, the variation of more preferably 0.10 or more display, poor refractive index.

The thickness G T.GT.GT of each layer when three layers of < stacking or more anisotropy light diffusion layer

In the case where anisotropic optical film has three layers or more anisotropy light diffusion layers, each anisotropic light expands The thickness for dissipating layer is preferably 15 μm or more and 100 μm or less.

The straight line transmittance > of each layer when three layers of < stacking or more anisotropy light diffusion layer

In the case where anisotropic optical film has three layers or more anisotropy light diffusion layers, each anisotropic light expands The maximum linear transmitance for dissipating layer is preferably 20% more than and less than 95%, also, minimum straight line transmittance be preferably 25% with Under.

The other modes > of < anisotropic optical film

Anisotropic optical film 100 involved in the method is by multiple by the composition comprising photopolymerizable compound (in the method, anisotropy light diffusion layer 110,120) film being laminated can for the anisotropy light diffusion layer that solidfied material is formed The laminate layers are laminated on translucent matrix, or translucent matrix can be laminated in the two sides of the laminated body.Here, as saturating Photosensitiveness matrix, the transparency it is more high the better, can properly use total light transmittance (JIS K7361-1) be 80% or more, more Preferably 85% or more, most preferably 90% or more matrix, in addition, can properly use haze value (JIS K7136) is 3.0 Below, 1.0 or less are more preferably, is most preferably 0.5 matrix below.Specifically, can be used transparent as translucent matrix Plastic foil, glass plate etc., but it is thin, light, be not easily broken, productivity is excellent in terms of, plastic foil is suitable.As specific Example, can enumerate polyethylene terephthalate (PET), polyethylene naphthalate (PEN), tri acetyl cellulose (TAC), polycarbonate (PC), polyether sulfone (PES), cellophane, polyethylene (PE), polypropylene (PP), polyvinyl alcohol (PVA), ring They can be used alone or as a mixture for olefin resin etc., and the material being laminated further can be used.In addition, about translucency The thickness of matrix, if it is considered that purposes, productivity, then preferably 1 μm~5mm, more preferably 10~500 μm, further preferably It is 50~150 μm.

In addition, anisotropic optical film according to the present invention can be used as the one of anisotropy light diffusion layer 110 or 120 The anisotropic optical film of other layers is provided on the face of side.As other layers, for example, polarizing layer, light diffusion layer, low can be enumerated Reflecting layer, stain-proofing layer, antistatic layer, ultraviolet light/near infrared ray (NIR) absorbed layer, filter neon layer, electromagnetic wave shielding etc..It can incite somebody to action Other layers stack gradually.Further, other layers can be laminated on the face of the two sides of anisotropy light diffusion layer 110 and/or 120. Other layers being laminated on the face of two sides can be layer with the same function, can also be the layer with different function.

" manufacturing method of anisotropic optical film involved in the method "

More than, the composition of anisotropic optical film 100 involved in the method is illustrated in detail, next, The manufacturing method of anisotropic optical film 100 with such composition is illustrated.

Anisotropic optical film 100 involved in the method can by by anisotropy light diffusion layer 110,120 directly or It is obtained across the stacking of adhesion coating 130, each anisotropy light diffusion layer 110,120 can be by specific photocurable compositions Nitride layer irradiates the light such as UV with special condition to manufacture.Hereinafter, first to the raw material of anisotropy light diffusion layer 110,120 into Row explanation, is then illustrated manufacturing process.

The raw material > of < anisotropy light diffusion layer

For the raw material of anisotropy light diffusion layer 110,120, with (1) photopolymerizable compound, (2) photoinitiator, (3) Use level, the sequence of any other ingredient are illustrated.

(photopolymerizable compound)

As formed the method involved in anisotropy light diffusion layer 110,120 material photopolymerizable compound by Selected from free-radical polymerised or cationically polymerizable functional group macromonomer, polymer, oligomer, in monomer Photopolymerizable compound and photoinitiator are constituted, to be polymerize by irradiation ultraviolet light and/or luminous ray, cured material Material.Here, even if forming anisotropy light diffusion layer 110,120, anisotropic light contained by other anisotropic optical films 100 The material of diffusion layer is one kind, also generates refringence by the difference of height of density.This is because the portion that the exposure intensity of UV is strong Point curing rate it is fast, therefore polymerize, curing materials are to moving around the consolidation zone, form the high area of refractive index as a result Domain and the low region of refractive index.It is explained, (methyl) acrylate is meant, can be acrylate or metering system Any one of acid esters.

Free-radical polymerised compound is mainly the compound in molecule containing more than one unsaturated double-bond, it is specific and Speech, can enumerate referred to as epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, polybutadiene allyl The acrylic acid oligomer and 2-EHA of the titles such as olefin(e) acid ester, organic silicon acrylic ester, isoamyl acrylate, Acrylate, butoxy ethyl, ethoxydiglycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, propylene The different norbornyl ester of acid, acrylic acid 2- hydroxy methacrylate, acrylic acid 2- hydroxy propyl ester, 2- acryloxy phthalic acid, acrylic acid Dicyclopentenyl ester, triethylene glycol diacrylate, neopentylglycol diacrylate, 1,6 hexanediol diacrylate, bisphenol-A EO addition product diacrylate, trimethylolpropane trimethacrylate, EO modified trimethylolpropane trimethacrylate, Ji Wusi Alcohol triacrylate, pentaerythritol tetraacrylate, two trimethylolpropane tetra-acrylates, dipentaerythritol hexaacrylate Equal acrylate monomers.In addition, these compounds can be used with each monomer, a variety of can also be used in mixed way.It is explained, Methacrylate similarly can also be used, but in general compared with methacrylate acrylate photopolymerization rate Fastly, therefore preferably.

As cationically polymerizable compound, can be used has more than one epoxy group, vinyl ether group, oxa- in molecule The compound of cyclobutane base.As the compound with epoxy group, 2- ethylhexyl diglycol glycidol ether, biphenyl can be enumerated Glycidol ether, bisphenol-A, hydrogenated bisphenol A, Bisphenol F, bisphenol-A D, bisphenol S, bisphenol-A, tetramethyl Bisphenol F, tetrachloro The 2-glycidyl ethers of the bisphenols such as bisphenol-A, tetrabromobisphenol A, phenol novolacs, cresol novolak, brominated phenol phenol The poly epihydric alcohol ethers of the novolac resins such as Novolac, o-cresol novolak, ethylene glycol, polyethylene glycol, polypropylene glycol, Butanediol, 1,6-HD, neopentyl glycol, trimethylolpropane, 1,4 cyclohexane dimethanol, bisphenol-A EO addition product, bis-phenol The 2-glycidyl ethers of the aklylene glycols class such as PO addition product of A, the ethylene oxidic ester of hexahydrophthalic acid, dimeric dibasic acid The glycidols esters such as 2-glycidyl ester.

As the compound with epoxy group, 3,4- epoxycyclohexyl-methyl -3 ', 4 '-epoxy hexamethylenes can be further enumerated Alkane formic acid esters, 2- (3,4- epoxycyclohexyl -5,5- spiral shell -3,4- epoxy) hexamethylene-m- twoAlkane, two (3,4- epoxy hexamethylenes Ylmethyl) adipate ester, two (3,4- epoxy -6- methylcyclohexylmethyl) adipate esters, 3,4- epoxy -6- methylcyclohexyl - 3 ', 4 '-epoxies -6 '-cyclohexanecarboxylic acid ester, di-2-ethylhexylphosphine oxide (3,4- 7-oxa-bicyclo[4.1.0), bicyclopentadiene diepoxy object, second Two (3,4- epoxycyclohexyl-methyl) ethers of glycol, ethylenebis (3,4- 7-oxa-bicyclo[4.1.0 formic acid esters), lactone-modified 3,4- ring Oxygen cyclohexyl methyl -3 ', 4 ' -7-oxa-bicyclo[4.1.0 formic acid esters, four (3,4- epoxycyclohexyl-methyl) ethylene-dimalonic acid esters, two (3, 4- epoxycyclohexyl-methyl) -4,5- epoxy tetrahydrophthalic acid ester etc. cycloaliphatic epoxy, but not limited to this.

As the compound with vinyl ether group, for example, diethylene glycol divinyl ether, triethylene glycol diethyl can be enumerated Alkene ether, butanediol divinyl ether, hexylene glycol divinyl ether, cyclohexanedimethanol divinyl base ether, hydroxybutyl vinyl Base ether, ethyl vinyl ether, dodecyl vinyl, trimethylolpropane tris vinyl ethers, propenyl ether propylidene carbonic acid Ester etc., but not limited to this.It is explained, vinyl ether compound is in general cationically polymerizable, but by with third The combination of olefin(e) acid ester can also carry out free radical polymerization.

In addition, the bis- [(3- ethyl -3- oxetanylmethoxy first of Isosorbide-5-Nitrae-can be used as the compound with oxetanyl Oxygroup) methyl] benzene, 3- ethyl -3- (hydroxymethyl)-oxetanes etc..

It is explained, above cationically polymerizable compound can be used with each monomer, and a variety of can also mix makes With.Above-mentioned photopolymerizable compound is not limited to above compound.In addition, in order to generate sufficient refringence, above-mentioned photopolymerization In property compound, fluorine atom (F) can be imported to realize low-refraction, also into sulphur atom (S), bromine atom (Br), various Metallic atom is to realize high index of refraction.Further, as disclosed in Japanese Unexamined Patent Application Publication 2005-514487 bulletin, to above-mentioned light It is also that effectively, the functionality ultramicron is by titanium oxide that polymerizable compound, which adds functional ultramicron, (TiO₂), zirconium oxide (ZrO₂), tin oxide (SnO_x) etc. high refractive indexes metal oxide constitute ultramicron surface import Made of the optical polymerism functional groups such as acryloyl group, methylacryloyl, epoxy group.

(photopolymerizable compound with silicone backbone)

In the method, as photopolymerizable compound, it is preferable to use the photopolymerizable compound with silicone backbone.Tool There is the photopolymerizable compound of silicone backbone as its structure (predominantly ehter bond) is orientated and is polymerize, solidifies, is formed low Refractive index area, high-refractive-index regions or region of low refractive index and high-refractive-index regions.By using with silicone backbone Photopolymerizable compound, be easy to make cylindrical region 113,123 to tilt, improved to the light-gathering of positive direction.It is explained It is either region of low refractive index is equivalent in cylindrical region 113,123 or matrix region 111,121, another party is equivalent to High-refractive-index regions.

In region of low refractive index, preferably as the organosilicon of the solidfied material of the photopolymerizable compound with silicone backbone Resin is opposite to be increased.It is improved thereby, it is possible to be easy to tilt scattering central axis further, therefore to the light-gathering of positive direction. Organic siliconresin more contains silicon (Si) compared with the compound for not having silicone backbone, therefore using the silicon as index, By using EDS (energy dispersion-type X-ray optical splitter), it is able to confirm that the opposite amount of organic siliconresin.

Photopolymerizable compound with silicone backbone is that have free-radical polymerised or cationically polymerizable function Monomer, oligomer, prepolymer or the macromonomer of group.As free-radical polymerised functional group, acryloyl group, first can be enumerated Base acryloyl group, acrylic etc. can enumerate epoxy group, oxetanyl etc. as the functional group of cationically polymerizable.These The type and quantity of functional group are not particularly limited, but since the functional group the more more improve crosslink density, are more easy to produce refraction Rate is poor thus preferred, therefore preferably has polyfunctional acryloyl group or methylacryloyl.In addition, with silicone backbone Compound is insufficient with the compatibility of other compounds because of its structure sometimes, in such a situation, can pass through amino first It is Esterification to improve compatibility.In the method, organosilicon-of the end with acryloyl group or methylacryloyl is properly used Carbamate-(methyl) acrylate.

The weight average molecular weight (Mw) of photopolymerizable compound with silicone backbone is preferably in 500~50,000 model It encloses.More preferably 2,000~20,000 range.By making weight average molecular weight be in above range, so as to cause sufficient light Curing reaction, the organic siliconresin being present in each anisotropy light diffusion layer of anisotropic optical film 100 become easy Orientation.With the orientation of organic siliconresin, becoming easy tilts scattering central axis.

As silicone backbone, for example, silicone backbone shown in the following general formula (1) meets.In general formula (1), R₁、 R₂、R₃、R₄、R₅、R₆There is methyl, alkyl, fluoroalkyl, phenyl, epoxy group, amino, carboxyl, polyether-based, propylene each independently The functional group of acyl group, methylacryloyl etc..In addition, n is preferably 1~500 integer in general formula (1).

[changing 1]

(compound without silicone backbone)

If the compound for not having silicone backbone is matched with the photopolymerizable compound with silicone backbone, shape At anisotropy light diffusion layer, then becomes easy separation and form region of low refractive index and high-refractive-index regions, it is anisotropic Degree becomes strong and preferred.Thermoplastic resin can be used other than photopolymerizable compound in compound without silicone backbone They can also be used in combination for rouge, thermosetting resin.As photopolymerizable compound, can be used have it is free-radical polymerised or it is positive from Polymer, oligomer, the monomer (only, not having silicone backbone) of the functional group of sub- polymerism.It, can as thermoplastic resin Enumerate polyester, polyethers, polyurethane, polyamide, polystyrene, polycarbonate, polyacetals, polyvinyl acetate, acrylic resin And its copolymer, modifier.Using thermoplastic resin, dissolved using the solvent of dissolution thermoplastic resin, After being coated and dried, solidifies the photopolymerizable compound with silicone backbone using ultraviolet light and form anisotropic light and expand Dissipate layer.As thermosetting resin, epoxy resin, phenolic resin, melamine resin, urea resin, unsaturated polyester (UP) can be enumerated And its copolymer, modifier.Using thermosetting resin, by keeping the light with silicone backbone poly- with ultraviolet light It carries out being suitable for heating after conjunction property compound cures, so that thermosetting resin be made to solidify and form anisotropic light diffusion layer.As Compound without silicone backbone, most preferably photopolymerizable compound, productivity are excellent: can be easily separated low refraction Rate region and high-refractive-index regions, without using thermoplastic resin when solvent and without drying process, be not necessarily to thermosetting resin Such curing process etc..

(photoinitiator)

As the photoinitiator that free-radical polymerised compound can be made to polymerize, benzophenone, benzil, rice Chi can be enumerated Ketone, 2-chlorothioxanthone, 2,4- diethyl thioxanthone, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2, 2- diethoxy acetophenone, benzil dimethyl ketal, 2,2- dimethoxy -1,2- diphenylethane -1- ketone, 2- hydroxyl -2- Methyl-1-phenyl-propane-1- ketone, 1- hydroxycyclohexylphenylketone, 2- methyl-1-[4- (methyl mercapto) phenyl]-2- morpholino third Ketone -1,1- [4- (2- hydroxyl-oxethyl)-phenyl] -2- hydroxy-2-methyl -1- propane -1- ketone, bis- (cyclopentadienyl groups)-it is bis- (2, The fluoro- 3- of 6- bis- (pyrroles -1- base) titanium, 2- benzyl -2- dimethylamino -1- (4- morphlinophenyl)-butanone -1,2,4,6- front three Base benzoyl diphenyl phosphine oxide etc..In addition, these compounds can be used with each monomer, a variety of can also be used in mixed way.

In addition, the photoinitiator of cationically polymerizable compound is can to irradiate to generate acid and utilize the generation by light Acid make the compound of above-mentioned cationically polymerizable compound polymerization, it is however generally that, properly useSalt, metallocene complexing Object.AsDiazonium can be used in saltSalt, sulphurSalt, iodineSalt, phosphorusSalt, seleniumSalt etc., as they to ion, BF can be used₄ ^-、PF₆ ^-、AsF₆ ^-、SbF₆ ^-Equal anion.As concrete example, 4- chlorobenzene diazonium can be enumeratedHexafluorophosphate, three Phenyl sulphurHexafluoro antimonate, triphenyl sulphurHexafluorophosphate, (4- Phenylsulfanylphenyl) diphenyl sulphurHexafluoro antimonate, (4- Phenylsulfanylphenyl) diphenyl sulphurHexafluorophosphate, bis- [4- (diphenyl sulphurBase) phenyl] thioether-is bis--hexafluoro-antimonic acid Salt, bis- [4- (diphenyl sulphurBase) phenyl] sulfide-pairs-hexafluorophosphate, (4- methoxyphenyl) diphenyl sulphurHexafluoro antimony Hydrochlorate, (4- methoxyphenyl) phenyl-iodideHexafluoro antimonate, bis- (4- tert-butyl-phenyl) iodineHexafluorophosphate, benzyl three Phenyl phosphorusHexafluoro antimonate, triphenyl seleniumHexafluorophosphate, (η 5- cumene) (η 5- cyclopentadienyl group) iron (II) six Fluorophosphate etc., but not limited to this.In addition, these compounds can be used with each monomer, a variety of can also be used in mixed way.

(use level, any other ingredient)

In the method, relative to 100 parts by weight of photopolymerizable compound, with 0.01~10 parts by weight, preferably with 0.1~7 Parts by weight more preferably with 0.1~5 parts by weight degree cooperate above-mentioned photoinitiator.This is because when less than 0.01 parts by weight, light Curability reduces, when being cooperated more than 10 parts by weight, lead to only surface cure and the curability of inside reduce it is such bad It influences, hinders the formation of coloring, column structure.Powder is usually directly dissolved in photopolymerizable compound by these photoinitiators And use, but in the case where dissolubility difference, it is possible to use photoinitiator is made to be dissolved in minimal amount of solvent in advance with high concentration Obtained by substance.As such solvent, further preferably optical polymerism, specifically, propene carbonate, γ-can be enumerated Butyrolactone etc..In addition, well known various dyestuffs, sensitizer can also be added in order to improve optical polymerism.It further, can also be with Photoinitiator, which is used together, to make the cured thermal cure initiators of photopolymerizable compound by heating.In this case, may be used Expect by being heated the polymerizing curable further to promote photopolymerizable compound after photocuring, to be formed complete Solidfied material.

In the method, above-mentioned photopolymerizable compound can be made individually to solidify or make a variety of composition solidifications mixed, Form anisotropy light diffusion layer 110,120.In addition, even if making photopolymerizable compound and the macromolecule without photo-curable The mixture of resin solidifies, and is also capable of forming the anisotropy light diffusion layer 110,120 of the method.As what is be able to use herein Macromolecule resin can enumerate acrylic resin, styrene resin, Styrene-acrylic copolymer, polyurethane resin, polyester tree Rouge, epoxy resin, cellulose-based resin, vinyl acetate resin, vinyl chloride vinyl acetate copolymer, polyvinyl alcohol contracting Butyral resin etc..These macromolecule resins and photopolymerizable compound need to have sufficient compatibility before photocuring, but are Ensure the compatibility, it is possible to use various organic solvents, plasticizer etc..Be explained, use acrylate as In the case where photopolymerizable compound, macromolecule resin is preferably selected as from acrylic resin in terms of compatibility.

The ratio of photopolymerizable compound with silicone backbone and the compound without silicone backbone is with quality The range of 15:85~85:15 is preferably in than counting.The more preferably range of 30:70~70:30.By being set to the range, thus The mutually separation for carrying out region of low refractive index and high-refractive-index regions is become easy, and is easy to tilt cylindrical region.If tool There is the ratio of the photopolymerizable compound of silicone backbone to be less than lower limit value or more than upper limit value, then becomes difficult to carry out phase point From, it is difficult to tilt cylindrical region.If using organosilicon-carbamate-(methyl) acrylate as with organosilicon The photopolymerizable compound of skeleton then improves the compatibility with the compound for not having silicone backbone.Therefore, even if expanding material The blending ratio of material can also be such that cylindrical region tilts.

(solvent)

As modulation include photopolymerizable compound composition when solvent, for example, can be used ethyl acetate, acetic acid fourth Ester, acetone, methyl ethyl ketone, methyl iso-butyl ketone (MIBK), cyclohexanone, toluene, dimethylbenzene etc..

< manufacturing process >

Next, being illustrated to the manufacturing method (technique) of the anisotropy light diffusion layer 110,120 of the method.It is first First, the composition by above-mentioned comprising photopolymerizable compound is (hereinafter, sometimes referred to as " Photocurable composition ".) be coated with or with piece Shape is set on the matrix appropriate as transparent PET film and is formed a film and Photocurable composition layer is arranged.The light is consolidated The property changed composition layer is dried as needed after so that solvent is volatilized, and illumination is incident upon on Photocurable composition layer, so as to Enough make anisotropy light diffusion layer 110,120.

(production of anisotropy light diffusion layer 110)

The formation process of anisotropy light diffusion layer 110 involved in the method mainly has following process.

(1) the process 1-1 being set to Photocurable composition layer on matrix

(2) the process 1-2 of parallel rays is obtained from light source

(3) make light to the incidence of Photocurable composition layer, make the cured process 1-3 of Photocurable composition layer

(composition comprising photopolymerizable compound is set to sheet to the method on matrix)

In above-mentioned operation 1-1, as will include the composition of photopolymerizable compound with sheet and be set to the side on matrix Method, applicable common coating method, mode of printing.Specifically, airblade coating, stick can be used to apply, scraping blade coating, scraping cutter painting Cloth, reversion coating, door roller coating cloth, gravure printing roller are coated with, kiss applies, casting applies, spray, gap nozzle is coated with (Slot orifice Coating), roll the intaglio printings, silk screen such as coating methods, the gravure version printings such as coating, baffle coating, dip-coating, die coating The printing etc. of the porous printings such as printing etc..In the case where composition is low viscosity, certain height can also be set around matrix The dike of degree, and the cast inside composition surrounded to the dike.

(stacking of mask)

In addition, the oxygen inhibition of Photocurable composition layer, makes as involved by the method in order to prevent in above-mentioned operation 1-1 And the cylindrical region 113 of feature of anisotropy light diffusion layer 110 be effectively formed, can also be laminated and be sealed at photo-curable group It closes the light irradiation side of nitride layer and makes the mask of the exposure intensity changes locally of light.It is preferably as follows as the material of mask The material of composition: the filler of the light absorption such as carbon is scattered in matrix, and a part of incident light is by carbon absorption, but opening portion can Make light fully through.As such matrix, there are a transparent plastics such as PET, TAC, PVAc, PVA, acrylic, polyethylene, glass, The inorganic matters such as quartz are also possible to the piece comprising these matrixes and carry out patterning for controlling ultraviolet light transit dose, containing inhaling Receive the matrix of the pigment of ultraviolet light.Using such mask, by carrying out light irradiation in a nitrogen atmosphere, thus Also the oxygen inhibition of Photocurable composition layer can be prevented.In addition, common transparent film layer is only laminated on Photocurable composition It is in terms of preventing oxygen inhibition and promoting the formation of cylindrical region 113 and effective on layer.Across such mask, hyaline membrane When carrying out light irradiation, in the composition comprising photopolymerizable compound, photopolymerization reaction corresponding with its exposure intensity is generated, Therefore it is easy to produce index distribution, the production for anisotropy light diffusion layer 110 involved in the method is effective.

(light source)

In addition, being used in above-mentioned operation 1-3 as by the light obtained in above-mentioned operation 1-2 to comprising optical polymerism chemical combination The composition (Photocurable composition layer) of object carries out the light source of light irradiation, light source occurs usually using short arc ultraviolet light, specifically For, high-pressure mercury-vapor lamp, Cooper-Hewitt lamp, metal halide lamp, xenon lamp etc. can be used.Furthermore, it is necessary to photo-curable group Collocation point light can be passed through to obtain such directional light by closing the light that irradiation is parallel with desired scattering central axis Q in nitride layer Source is configured to the optical lenses such as the Fresnel Lenses of irradiation directional light between the point light source and Photocurable composition layer, Directional light is irradiated to Photocurable composition layer, to make anisotropy light diffusion layer 110.On the other hand, using linear In the case where light source, what it is as documented by Japanese Unexamined Patent Publication 2005-292219 bulletin, in linear light source and sheet includes photopolymerization Property compound composition between, across the set of tubular article, light irradiation is carried out by the tubular article, so as to make it is each to Anisotropic light diffusion layer 110.If being able to carry out continuous production, therefore preferably using linear light source.It, can as linear light source It uses chemical lamp (fluorescent lamp of outgoing ultraviolet light).About chemical lamp, it is commercially available have 20~50mm of diameter, length of illumination 100~ The chemical lamp of 1500mm degree carries out being suitable for selection in combination with the size of made anisotropy light diffusion layer 110.

The light irradiated to the composition comprising photopolymerizable compound is needed comprising that can solidify the optical polymerism chemical combination The wavelength of object usually utilizes the light of the wavelength centered on 365nm of mercury vapor lamp.Anisotropy is being made using the wavelength band In the case where light diffusion layer 110,120, as luminosity, preferably 0.01~100mW/cm²Range, more preferably 0.1~ 20mW/cm²Range.This is because if luminosity is less than 0.01mW/cm², then solidification needs for a long time, therefore production efficiency becomes Difference, if it exceeds 100mW/cm², then the solidification of photopolymerizable compound is too fast forms without structure, so that becoming can not Show target anisotropy parameter characteristic.It is 10~180 seconds in addition, the irradiation time of light is not particularly limited, more preferably 30 ~120 seconds.Later, by removing mold release film, so as to obtain the anisotropy light diffusion layer 110 of the method.

The anisotropy light diffusion layer 110 of the method can pass through the light by long period irradiation low luminosity as described above It is obtained to form specific internal structure in Photocurable composition layer.Therefore, only carrying out such light irradiation can remaining Unreacted monomer component leads to the problem of viscosity sometimes and generates operability, durability.In this case, it can add Irradiate 1000mW/cm²The light of above high luminosity polymerize residual monomers.Light irradiation at this time can be from the side that mask has been laminated Opposite side carry out.

(production of anisotropy light diffusion layer 120)

Next, on one side referring to Fig. 9, on one side to the production method of anisotropy light diffusion layer 120 involved in the method (technique) is illustrated, and is mainly illustrated to the difference of the technique with anisotropy light diffusion layer 110.Fig. 9 is to indicate this The schematic diagram of the manufacturing method of anisotropy light diffusion layer 120 involved in mode.

The formation process of anisotropy light diffusion layer 120 involved in the method mainly has following process.

(1) Photocurable composition layer 102 is set to the process 2-1 of matrix 101

(2) the process 2-2 of parallel rays D is obtained from light source 103

(3) make parallel rays D incident to directive property diffused component 105, obtain the process 2-3 of the light E with directive property

(4) make the light E with directive property incident to Photocurable composition layer 102, keep Photocurable composition layer 102 solid The process 2-4 of change

It is same as anisotropy light diffusion layer 110 for process 2-1 and 2-2.

It can be suitable for selecting to be formed by column by adjusting the diffusion of the light E with directive property in process 2-3 The size (aspect ratio, minor axis SA, major diameter LA etc.) in region 123.For example, this can be obtained in Fig. 9 (a), (b) in any figure The anisotropy light diffusion layer 120 of mode.Fig. 9 (a) and (b) the difference is that, the diffusion of the light E with directive property It is big compared in (a), it is medium and small at (b).According to directive property light E diffusion size, cylindrical region 123 it is big Small meeting is different.

The diffusion of light E with directive property relies primarily on directive property diffused component 105 and Photocurable composition layer 102 distance and the type of directive property diffused component 105.With making the distance shorten, the size of cylindrical region 123 becomes smaller, With elongated, the size of cylindrical region 123 becomes larger.Therefore, by adjusting the distance, the size of cylindrical region 123 can be adjusted.

(light source 103)

As the light source for carrying out light irradiation to the composition (Photocurable composition) comprising photopolymerizable compound 103, with same, usually used short arc ultraviolet light generation light source when forming anisotropy light diffusion layer 110.To including optical polymerism The light of the composition irradiation of compound needs the wavelength comprising that can solidify the photopolymerizable compound, usually utilizes mercury vapor lamp The wavelength centered on 365nm light, but as long as it includes close with the absorbing wavelength of used Photoepolymerizationinitiater initiater for being Any lamp may be used in the light source of wavelength.In process 2-4, by solidifying Photocurable composition layer, to be formed each to different Property light diffusion layer 120.

In order to make parallel rays D from the light of the UV light from above-mentioned short arc, for example, the back in light source 103 can be passed through After configure reflecting mirror, to defined direction make light as point light source be emitted, so as to obtain parallel rays D.If point of use Light source then can simply obtain parallel rays D.

(directive property diffused component 105)

As long as directive property diffused component 105 used in process 2-3 assigns directive property to incident parallel rays D It can.It is described in Fig. 9, the multidirectional X-direction diffusion of the light E with directive property, the form hardly spread to Y-direction.In this way, in order to The light for having directive property is obtained, for example, following method can be used: making needle high containing aspect ratio in directive property diffused component 105 Shape filler, and it is orientated the needle-shaped filler in such a way that long axis direction extends to Y-direction.Directive property diffused component 105 in addition to Other than method using needle-shaped filler, various methods can be used.According to the type of directive property diffused component 105, light Diffusivity can be different according to the difference of the incident portion to directive property diffused component 105, as long as but parallel rays D across finger Tropism diffused component 105 and obtain the mode of light E with directive property and configure.

The aspect ratio of light E with directive property is preferably set to 2 or more and 20 or less.With shape substantially corresponding with the aspect ratio Formula forms the aspect ratio of cylindrical region 123.As above-mentioned aspect ratio becomes smaller, the danger for thering is range of scatter to narrow, therefore, we In formula, aspect ratio is set as 2 or more.On the other hand, the upper limit value of above-mentioned aspect ratio is preferably 10 hereinafter, more preferably 5 or less. As aspect ratio becomes larger, the danger that there is the diffusivity of light, light-gathering to become inadequate.

(solidification)

In process 2-4, by keeping the light E with directive property incident to Photocurable composition layer 102, make the photo-curable Composition layer solidification, so as to obtain the anisotropy light diffusion layer 120 of the method.Photocurable composition layer 102 and each Painting similarly, by being coated on the matrix appropriate 101 as transparent PET film is arranged in anisotropy light diffusion layer 110 Cloth film (Photocurable composition layer).Being dried as needed makes solvent volatilize, and dry film thickness is preferably 15~100 μm. Further, the coated film or cured film upper layer pressure mold release film, aftermentioned mask and make photosensitive laminate.

It is explained, for will include that the composition (Photocurable composition) of photopolymerizable compound is set with sheet It is placed in method on matrix 101, the stacking of mask, boost 1000mW/cm²In terms of the light of above high luminosity etc., as above It is described.

It directly or across adhesion coating 130 is laminated by the anisotropy light diffusion layer 110,120 that will as above make, from And anisotropic optical film 100 involved in the method can be obtained.

It as sticker used in above-mentioned adhesion coating 130, is not particularly limited, but is suitble to as long as there is the transparency Use the sticker under room temperature with pressure-sensitive cementability.As such sticker, for example, polyester based resin, epoxy can be enumerated It is the resins such as resin, polyurethane series resin, organic silicon-type resin, acrylic resin.In particular, the optics of acrylic resin The transparency is high, relatively inexpensive etc., therefore preferred.Across adhesion the multiple light diffusion layers of layer stackup (in the method, light diffusion layer 110, 120) in the case where, the thickness of adhesion coating is preferably 5~50 μm of degree.

On the other hand, the case where anisotropy light diffusion layer 120 is directly laminated in anisotropy light diffusion layer 110 Under, as long as the anisotropy after the Photocurable composition layer solidification of anisotropy light diffusion layer 110 being used for, after the solidification Directly coating is included the composition of photopolymerizable compound or is arranged with piece on light diffusion layer 110.Further, by with it is each Anisotropy light diffusion layer 110 operates in the same way to make anisotropy light diffusion layer 120, so as to obtain involved by the method Anisotropic optical film 100.

" purposes of anisotropic optical film involved in the method "

More than, the composition and manufacturing method of anisotropic optical film 100 involved in the method are said in detail It is bright, next, 0 and Figure 11 referring to Fig.1 on one side, is on one side illustrated the Suitable applications of above-mentioned anisotropic optical film 100. Figure 10 and Figure 11 is indicate to have used the composition of the liquid crystal display device of anisotropic optical film 100 involved in the method one The schematic diagram of example.

Anisotropic optical film 100 involved in the method is suitable as display device diffusion barrier.As benefit can be suitble to With the display device of anisotropic optical film 100, for example, liquid crystal display device (LCD), plasma display panel can be enumerated (PDP), organic el display, Field Emission Display (FED), rear projection projector, cathode tube display device (CRT), surface field Display (SED), Electronic Paper etc..Particularly preferred for LCD.

In addition, for example, in the case where anisotropic optical film 100 involved in the method is used for LCD, as long as The emergent light side of LCD configures anisotropic optical film 100.Specifically, as shown in Figure 10 and Figure 11, it is transparent being formed with Be clamped between a pair of of transparent glass substrate 1011,1012 of electrode nematic liquid crystal 1013 and the glass substrate 1011, 1012 two sides are provided in the LCD of a pair of of polarizer 1014,1015, can be on polarizer 1014 or in 1011 He of glass substrate Between polarizer 1014, anisotropic optical film 100 involved in the method is configured.It is explained, as above-mentioned transparent Generally known object can be used in glass substrate, nematic liquid crystal, polarizer etc..

[embodiment]

Next, further illustrating the present invention by embodiment and comparative example, but the present invention is not appointed by these examples What is limited.

[manufacture of anisotropic optical film]

In accordance with the following methods, the anisotropic optical film of anisotropic optical film and comparative example of the invention is manufactured.

(embodiment 1)

In the edge part complete cycle of 100 μm of thickness of PET films (Dongyang spinning company system, trade name: A4300), dispenser is used The next door of height 0.03mm is formed with curable resin.Following Photocurable resin compositions are filled thereto, and are covered with PET film Lid.

Organosilicon-urethane acrylates (refractive index: 1.460, weight average molecular weight: 5,890) 20 parts by weight

(RAHN corporation, trade name: 00-225/TM18)

Neopentylglycol diacrylate (refractive index: 1.450) 30 parts by weight

(Daicel-Cytec corporation, trade name Ebecryl145)

The EO addition product diacrylate (refractive index: 1.536) 15 parts by weight of bisphenol-A

(Daicel-Cytec corporation, trade name: Ebecyl150)

Phenoxyethyl acrylate (refractive index: 1.518) 40 parts by weight

(common prosperity society chemistry system, trade name: Light Acrylate PO-A)

4 parts by weight of 2,2- dimethoxy -1,2- diphenylethane -1- ketone

(BASF (BASF) corporation, trade name: Irgacure651)

The liquid film for the 0.03mm thickness that two sides PET film is clamped heats, will be from UV point light source (Bang Song photonics company System, trade name: L2859-01) fall penetrate with illumination unit be emitted parallel UV light from top along coated surface normal direction hang down Directly with exposure intensity 5mW/cm²Irradiation 1 minute, being formed on a pet film, there is the anisotropic light of a large amount of column structures to spread Layer.

Further, using the next door of 0.05mm, by from UV point light source fall penetrate the parallel rays that is emitted with illumination unit every Through UV light aspect ratio be 3 directive property diffused component be transformed into the ultraviolet light of linear light source from upper vertical to shine Penetrate intensity 5mW/cm²Irradiation 1 minute forms the anisotropy light diffusion layer with multiple column structures on a pet film.

After PET film is removed, size (aspect ratio, major diameter LA of the column structure of each anisotropy light diffusion layer are measured With minor axis SA), table 1 is shown the result in.Further, the transparency by two anisotropy light diffusion layers across 25 μ m thicks is adhered Material stacking, evaluates the optical characteristics of resulting anisotropic optical film, shows the result in table 2.

(embodiment 2)

As directive property diffused component, the directive property diffused component for the use of the aspect ratio through UV light being 8, except this with Outside, it operates similarly with example 1, obtains the anisotropic optical film of embodiment 2.It evaluates in resulting anisotropic optical film Each anisotropy light diffusion layer column structure size and anisotropic optical film optical characteristics, show the result in table 1 and table 2.

(embodiment 3)

As directive property diffused component, the directive property diffused component for the use of the aspect ratio through UV light being 16, except this with Outside, it operates similarly with example 1, obtains the anisotropic optical film of embodiment 3.It evaluates in resulting anisotropic optical film Each anisotropy light diffusion layer column structure size and anisotropic optical film optical characteristics, show the result in table 1 and table 2.

(embodiment 4)

Be changed to the covering of the PET film of first layer to be irregularly patterned with the photomask of 4 μm of pore, except this with Outside, it operates similarly with example 1, obtains the anisotropic optical film of embodiment 4.It evaluates in resulting anisotropic optical film Each anisotropy light diffusion layer column structure size and anisotropic optical film optical characteristics, show the result in table 1 and table 2.

(embodiment 5)

Member is spread as 4 μm of directive property using the minor axis through UV light of the directive property diffused component in embodiment 1 Part operates similarly with example 1 in addition to this, obtains the anisotropic optical film of embodiment 5.It evaluates resulting respectively to different Property optical film in each anisotropy light diffusion layer column structure size and anisotropic optical film optical characteristics, will As a result shown in table 1 and table 2.

(embodiment 6)

Member is spread as 35 μm of directive property using the major diameter through UV light of the directive property diffused component in embodiment 3 Part operates similarly with example 1 in addition to this, obtains the anisotropic optical film of embodiment 6.It evaluates resulting respectively to different Property optical film in each anisotropy light diffusion layer column structure size and anisotropic optical film optical characteristics, will As a result shown in table 1 and table 2.

(embodiment 7)

The next door of first layer is set as 0.015mm, in addition to this, is operated similarly with example 1, embodiment 7 is obtained Anisotropic optical film.Evaluate the big of the column structure of each anisotropy light diffusion layer in resulting anisotropic optical film Small and anisotropic optical film optical characteristics, shows the result in Tables 1 and 2.

(embodiment 8)

The next door of first layer is set as 0.02mm, in addition to this, is operated similarly with example 1, each of embodiment 8 is obtained Anisotropy optical film.Evaluate the size of the column structure of each anisotropy light diffusion layer in resulting anisotropic optical film With the optical characteristics of anisotropic optical film, Tables 1 and 2 is shown the result in.

(embodiment 9)

The next door of the second layer is set as 0.03mm, in addition to this, is operated similarly with example 1, each of embodiment 9 is obtained Anisotropy optical film.Evaluate the size of the column structure of each anisotropy light diffusion layer in resulting anisotropic optical film With the optical characteristics of anisotropic optical film, Tables 1 and 2 is shown the result in.

(embodiment 10)

The parallel UV light that the anisotropy parameter layer of 25 ° of irradiation second layers is tilted from the normal direction of coated surface, removes this In addition, it operates similarly with example 1, obtains the anisotropic optical film of embodiment 10.Evaluate resulting anisotropic optical The size of the column structure of each anisotropy light diffusion layer in film and the optical characteristics of anisotropic optical film, result is shown In Tables 1 and 2.

(embodiment 11)

The parallel UV light that the anisotropy parameter layer of 10 ° of irradiation first layers is tilted from the normal direction of coated surface, from painting The normal direction of film surface tilts the parallel UV light of the anisotropy parameter layer of 20 ° of irradiation second layers, in addition to this, with embodiment 1 operates in the same way, and obtains the anisotropic optical film of embodiment 11.Evaluate in resulting anisotropic optical film it is each respectively to The size of the column structure of anisotropic light diffusion layer and the optical characteristics of anisotropic optical film, show the result in Tables 1 and 2.

(embodiment 12)

The laminated body of anisotropy parameter layer same as Example 1 is not made across sticker.Obtain each of first layer After Anisotropic diffusion layer, after the PET film of covering is removed, by the next door of 0.05mm it is additional be formed in have been formed on first layer every On wall, same Photocurable resin composition is filled on the anisotropy light diffusion layer of first layer, and is covered with PET film Lid.Later, to form second layer anisotropy light diffusion layer by similarly operating, obtained first layer closely sealed and the second layer it is each Anisotropy optical film.Evaluate the size of the column structure of each anisotropy light diffusion layer in resulting anisotropic optical film With the optical characteristics of anisotropic optical film, Tables 1 and 2 is shown the result in.

(comparative example 1)

Make anisotropy parameter layer identical with the first layer of embodiment 1.Expand due to only having made an anisotropy Layer is dissipated, therefore is unable to get the anisotropic optical film for being laminated with anisotropy parameter layer.That is, only being had in this comparative example There is the anisotropic optical film of one layer of anisotropy light diffusion layer identical with the first layer of embodiment 1.Evaluate it is resulting respectively to The size of the column structure of each anisotropy light diffusion layer in anisotropic optical film and the optical characteristics of anisotropic optical film, Show the result in Tables 1 and 2.

(comparative example 2)

By the directive property diffused component of embodiment 1 be changed to the aspect ratio through UV light be 50, the finger that major diameter is 100 μm Tropism diffused component similarly only makes second layer anisotropy parameter layer in addition to this.Due to only making 1 anisotropy Diffusion layer, therefore it is unable to get the anisotropic optical film for being laminated with anisotropy parameter layer.That is, being obtained only in this comparative example Anisotropic optical film with one layer of above-mentioned anisotropy light diffusion layer.It evaluates each in resulting anisotropic optical film The size of the column structure of anisotropy light diffusion layer and the optical characteristics of anisotropic optical film, show the result in table 1 and table 2。

(comparative example 3)

By the directive property diffused component of embodiment 1 be changed to the aspect ratio through UV light be 50, the finger that major diameter is 100 μm Tropism diffused component gets similarly the anisotropic optical film of comparative example 3 in addition to this.Evaluate resulting anisotropic light The size of the column structure of each anisotropy light diffusion layer in film and the optical characteristics of anisotropic optical film are learned, by result Shown in table 1 and table 2.

(comparative example 4)

Without using the directive property diffused component of embodiment 1, in addition to this, the anisotropic light of comparative example 4 is got similarly Learn film.Evaluate the size of the column structure of each anisotropy light diffusion layer in resulting anisotropic optical film and each to different The optical characteristics of property optical film, shows the result in Tables 1 and 2.

(comparative example 5)

It is used together that the aspect ratio through UV light is 50, major diameter is 100 μm with first layer, the second layer of embodiment 1 Directive property diffused component gets similarly the anisotropic optical film of comparative example 5 in addition to this.Evaluate resulting anisotropy The size of the column structure of each anisotropy light diffusion layer in optical film and the optical characteristics of anisotropic optical film, will tie Fruit is shown in table 1 and table 2.

(comparative example 6)

Only make anisotropy parameter layer identical with the second layer of embodiment 1.Expand due to only making an anisotropy Layer is dissipated, therefore is unable to get the anisotropic optical film for being laminated with anisotropy parameter layer.That is, only being had in this comparative example There is the anisotropic optical film of one layer of anisotropy light diffusion layer identical with the second layer of embodiment 1.Evaluate it is resulting respectively to The size of the column structure of anisotropy light diffusion layer in anisotropic optical film and the optical characteristics of anisotropic optical film, will tie Fruit is shown in table 1 and table 2.

[size of cylindrical region and the evaluation method of optical characteristics]

About the anisotropic optical film of embodiment and comparative example manufactured as above, evaluated as follows.

(measurement of organosilicon-urethane acrylates weight average molecular weight)

About the organosilicon-urethane acrylates weight average molecular weight (Mw) for being used as photopolymerizable compound Measurement, as polystyrene conversion molecular weight, using GPC method with the progress of following conditions.

Degasser: DG-980-51 (Japan Spectroscopy Corporation's system)

Pump: PU-980-51 (Japan Spectroscopy Corporation's system)

Autosampler: AS-950 (Japan Spectroscopy Corporation's system)

Thermostat: C-965 (Japan Spectroscopy Corporation's system)

Column: KF-806L × 2 piece Shodex (Showa Denko K. K's system)

Detector: RI (SHIMAMURA YDR-880)

Temperature: 40 DEG C

Eluent: THF

Injection rate: 150 μ l

Flow: 1.0ml/min

Sample concentration: 0.2%

(observing on the surface of anisotropic optical film)

Using optical microscopy to surface (photograph when irradiation ultraviolet light of the anisotropic optical film of embodiment and comparative example Penetrate light side) it is observed, measure major diameter LA, the minor axis SA of cylindrical region.In order to calculate major diameter LA and minor axis SA, arbitrary 20 are taken Maximum value in a structure.In addition, being calculated the major diameter LA/ minor axis SA found out before as aspect ratio.

(straight line transmittance)

Use the light projector angle that can arbitrarily change light source as shown in Figure 2, the goniophotometer of the acceptance angle of detector Goniophotometer (GENESIA corporation) carries out the optical characteristics of the anisotropic optical film of embodiment and comparative example Evaluation.Embodiment is set on the position fixed detector for receiving the straight light from light source, the specimen holder between and is compared Anisotropic optical film obtained in example.As shown in Fig. 2, making sample rotates, measurement and each incident light angle with rotary shaft (L) Corresponding straight line penetrates light quantity.By the evaluation method, incident light can be evaluated and be diffused with the range of which kind of angle. The rotary shaft (L) is axis identical with the C-C axis in the structure of sample shown in Fig. 6 (b) and Fig. 7 (b).Straight line is through light quantity In measurement, the wavelength of filter measurement visible light region is spent using visual sense.It is with the resulting optical profile of the result as above measured Basis finds out the maximum value (maximum linear transmitance) and minimum value (minimum straight line transmittance) of straight line transmittance (referring to table 1).

(diffusion of the direction MD and the diffusion of the direction TD)

Using device as shown in figure 12, irradiated from anisotropic optical film of the fixed light source to embodiment and comparative example Straight light makes detector mobile (rotation) to the direction MD and the direction TD on one side, makes dissipating from the anisotropic optical film on one side It penetrates through light light to detector, to measure transmitance.It is moved in the case of detector is mobile to the direction MD and to the direction TD Dynamic situation makes optical profile based on the measurement of above-mentioned transmitance respectively.Then, from when being moved to the direction MD and the direction TD Each optical profile find out the range of 1/2 angle for maximum transmission, by the range be set to the diffusion of the direction MD and The width (°) of the direction TD diffusion.

(change dramatically of brightness)

In the measurement of above-mentioned straight line transmittance, as shown in figure 13, if being set as maximum linear transmitance F_A(%'s) Angle A (°) and it is set as minimum straight line transmittance F_BBetween the angle B (°) of (%), straight line transmittance sharp changes, then Brightness also sharp changes, therefore after finding out the inclination angle of straight line transmittance, is judged as follows: if the inclination angle is steep, There is the change dramatically of brightness, if inclination angle is slow, the not no change dramatically of brightness.Specifically, being judged as follows: will be above-mentioned The inclination alpha of straight line transmittance is set as (F_A-F_B)/| A-B |, if the inclination alpha is α >=1.7, there is the change dramatically of brightness, if For 1.5≤α < 1.7, then change it is slightly steep but for allowed band, if it is α < 1.5, the variation of brightness it is slow and without sense of discomfort.It gives With explanation, as shown in figure 13, when two kinds of maximum linear transmitance (F are individually present_A1And F_A2) and minimum straight line transmittance (F_B1And F_B2) when, in following (a), (b), the bigger person of value is set as F_AWith A and F_BAnd B.

(a)(F_A1-F_B1)/|A₁-B₁|

(b)(F_A2-F_B2)/|A₂-B₂|

That is, as from maximum linear transmitance to the inclination alpha of minimum straight line transmittance, being used above-mentioned (a) in optical profile (b) value of the big side in.

(dazzle)

Reflection layer is set in the lower layer of embodiment and the anisotropic optical film of comparative example, keeps light incident from the upper side, The dazzle of its reflected light of visual confirmation.

[table 1]

[table 2] evaluation

< evaluation criteria >

The evaluation criteria of evaluation in table 2 is as follows.

" maximum linear transmitance "

55% or more ◎

0 40% more than and less than 55%

△ 30% is more than and less than 40%

× less than 30%

" diffusion of the direction MD "

40 ° of ◎ or more

0 30 ° more than and less than 40 °

20 ° of △ more than and less than 30 °

× less than 20 °

" diffusion of the direction TD "

40 ° of ◎ or more

0 30 ° more than and less than 40 °

20 ° of △ more than and less than 30 °

× less than 20 °

" change dramatically of brightness "

The variation of ◎ brightness is slow, no sense of discomfort

△ variation is slightly steep but is allowed band

× there is the change dramatically of brightness

" dazzle "

◎ free from glare

△ slightly dazzle but be allowed band

× there is obvious dazzle

[evaluation result]

As shown in table 2, the anisotropic optical film of embodiment obtains maximum linear transmitance and the direction MD and TD with high The wide of direction obtains diffusion breadth, also, the not change dramatically of brightness, dazzle balancedly has in whole assessment items High-caliber characteristic.In particular, in embodiment 1, the not evaluation of △, it can be said that being especially excellent anisotropic optical Film.On the other hand, the anisotropic optical film of comparative example has the evaluation more excellent than embodiment in specific project, but most Big straight line transmittance, the diffusion of the direction MD, the diffusion of the direction TD, the change dramatically of brightness, the item at least more than any one in dazzle Mesh with × it is such excessively poor as a result, balancedly having in whole assessment items unlike embodiment high-caliber Characteristic.

Therefore, the anisotropic optical film of embodiment can take into account high straight line transmittance and the side MD in non-diffusing regions To and the direction TD on wide diffusion zone, in the feelings for the diffusion barrier that such anisotropic optical film is used as to display panel Under condition, excellent display characteristic (brightness, contrast etc.) can be kept, and inhibit the generation of the change dramatically of brightness, dazzle.

More than, the preferred embodiments of the present invention is directed at while referring to attached drawing and is illustrated, but the present invention is unlimited In above-mentioned form.That is, it is understood that in the range of the invention documented by the scope of the claims, for the technology of this field Other forms or various modifications example that personnel are contemplated that, also belong to technical scope of the invention.

For example, in above-mentioned form, to two layers of anisotropy light diffusion layer 110 and anisotropy light diffusion layer 120 Anisotropic optical film 100 as anisotropy light diffusion layer is illustrated, but anisotropic light according to the present invention Learn the anisotropy light diffusion layer that film there can also be three layers or more.

Symbol description

100 anisotropic optical films

101 matrixes

102 Photocurable composition layers

103 light sources

105 directive property diffused components

110 (there is rod structure) anisotropy light diffusion layers (a)

111 matrix regions

113 cylindrical regions

120 (there is intermediate structure) anisotropy light diffusion layers (b)

121 matrix regions

123 cylindrical regions

130 adhesion coatings

SA minor axis

LA major diameter

Claims

1. a kind of anisotropic optical film, which is characterized in that be to be laminated with two layers or more straight line transmittance according to incident light angle The anisotropic optical film of changed anisotropy light diffusion layer,

Multiple column areas that the anisotropy light diffusion layer respectively has matrix region and refractive index different from the matrix region Domain,

As the anisotropy light diffusion layer, at least with short in the section vertical with the differently- oriented directivity of the cylindrical region The diameter two kind anisotropy light diffusion layer as and anisotropy light diffusion layer b different from aspect ratio, that is, major diameter/minor axis of major diameter,

The aspect ratio of the minor axis of the cylindrical region of the anisotropy light diffusion layer a and major diameter be less than 2,

The minor axis of the cylindrical region of the anisotropy light diffusion layer b and the aspect ratio of major diameter are 2 or more and 20 below In range.

2. anisotropic optical film according to claim 1, which is characterized in that

In the anisotropy light diffusion layer a, the maximum diameter of the minor axis in the section of the cylindrical region is set as 0.5~5 μ The maximum diameter of major diameter is set as the value in 0.5~8 μ m by the value within the scope of m,

In the anisotropy light diffusion layer b, the maximum value of the minor axis in the section of the cylindrical region is set as 0.5~5 μ The maximum diameter of major diameter is set as the value in 1~40 μ m by the value within the scope of m.

3. anisotropic optical film according to claim 1 or 2, which is characterized in that the anisotropy light diffusion layer is each From, become maximum with straight line transmittance when straight line transmittance, that is, maximum linear transmitance of light of incident light angle incidence be 20% more than and less than 95%, also, the straight line transmission of the light of incident light angle incidence when becoming minimum with straight line transmittance Rate is that minimum straight line transmittance is 25% or less.

4. anisotropic optical film according to claim 3, which is characterized in that the institute of the anisotropy light diffusion layer a Stating maximum linear transmitance is 20% more than and less than 60%, also, the minimum straight line transmittance is 20% hereinafter, described each The maximum linear transmitance of anisotropy light diffusion layer b is 30% more than and less than 95%, also, the minimum straight line penetrates Rate is 25% or less.

5. anisotropic optical film according to claim 1 or 2, which is characterized in that

The anisotropy light diffusion layer respectively has at least one scattering central axis,

If polar angle θ formed by the normal of the anisotropy light diffusion layer and the scattering central axis is set as scattering central axis Angle, the then scattering center of the scattering central axis angle of the anisotropy light diffusion layer a and the anisotropy light diffusion layer b The absolute value of the difference of shaft angle degree is 0 ° or more and 30 ° or less, wherein the θ is -90 ° of 90 ° of < θ <.

6. anisotropic optical film according to claim 1 or 2, which is characterized in that the anisotropy light diffusion layer is each From with a thickness of 15 μm or more and 100 μm or less.

7. anisotropic optical film according to claim 1 or 2, which is characterized in that expand in the multiple anisotropic light Interlayer is dissipated, further there is the adhesion coating with the transparency.

8. a kind of manufacturing method of anisotropic optical film, which is characterized in that be to obtain according to claim 1~any one of 7 The manufacturing method of the anisotropic optical film of the anisotropic optical film, comprising:

It forms the anisotropy light diffusion layer a formation process of the anisotropy light diffusion layer a and forms the anisotropy The anisotropy light diffusion layer b formation process of light diffusion layer b,

The anisotropy light diffusion layer a formation process has:

From light source obtain parallel rays process and

Make light to the incidence of Photocurable composition layer, make the cured process of Photocurable composition layer,

The anisotropy light diffusion layer b formation process has:

From light source obtain parallel rays process,

Make the parallel rays incident to directive property diffused component, process that obtain the light with directive property and

Make the light with directive property to the incidence of Photocurable composition layer, make the cured process of Photocurable composition layer.

9. the manufacturing method of anisotropic optical film according to claim 8, which is characterized in that described with directive property The aspect ratio of light is in 2 or more and 20 or less range.